How to make light reflection in 4 steps

Theories that explain how to draw the interaction between light and glass surfaces are complex, and can take a lot of time to fully explain. For now, we’ll approach things simply, using a method that takes advantage of shortcuts.

The first shortcut is to treat all similar transparent surfaces, such as plastic, as glass. Even if these materials don’t have exactly the same reactions to light, you can generally use this trick to simplify the process.


In most cases, a designer’s sketches are not meant to be ultra-realistic, but to be simply a viable representation that is both forceful and attractive.

Sony-earphone-a-choutac-chungChou-Tac Chung – Sony Concept earphone , 2014 
Below are some concrete approaches ready to be put into practice for fast and effective results. With these you will gain confidence and be able to begin to tackle more complex subjects.


No matter how complex the object, represent the reflection of light in the most simplistic way possible. This contrast will only enhance the effect.

In drawing light on surfaces, there are multiple factors in play, such as reflection, refraction, light transmission and opacity. Some surfaces are less reflective than others.

For our exercise, we’ll assume all reflective surfaces act like very reflective glass. For this sketch, we’ll simplify the image and discard all but the essentials.

Sony-earphone-zoom-in-choutac-chungI’ve selected the four following factors to focus on:

  • Thickness of the glass
  • Surface shape
    (is it flat or curved?)
  • The illuminated area
  • The background elements

  • TIP

    Minimize the number of factors in order to simplify and clarify the image.


    1. Thickness of glass

    Draw the thickness of the glass lining the edges of the object. This inner line should be very slight.


    2. Surface shape

    You can draw reflections with outlines that don’t exist on the object in reality. These outlines make the edges of the lit area clear, and will help you to draw around the illuminated area without breaching it.

    Remember to keep your lines fluid if you’re drawing a curved object.


    3. The illuminated surface

    The area where light is reflected by the object will be completely white. This will create a contrast which gives the impression of reflected light.

    Error: Note the presence of a curved line that cuts an area in half. That is, in fact, part of the original ellipse of the sketch. I made the mistake of beginning my sketch with overly heavy lines.


    4. The background elements

    This is the main secret:
    While drawing, place your light reflections in a fashion that means they hide some of the visual elements placed behind them. Of course, make sure what you block out doesn’t take away from the comprehension of the drawing. If the image is symmetrical you can hide a fair amount, as the brain will automatically recreate the hidden part of the drawing.


    I used three drawing utensils:

  • a 0.5mm ballpoint pen
  • a 0.7mm ballpoint pen (standard)
  • a PILOT twin marker

  • Multiple drawing utensils aren’t necessary. These three are an easy combination for creating strong contrasts.



    p align=”justify”>A few mistakes have crept into the sketch, but the final result still stands strong. Be demanding with yourself, but remember to keep moving and to deal with your mistakes. This is a sketch, not a technical blueprint.

    A designer draws to produce ideas, not solely to create beautiful illustrations. There is a sense of production in design work, and efficacy. If a designer aims to optimize their work and research time, the drawing too will benefit. The faster and better you draw, the more your final ideas will have the chance to become successful, and visa-versa.

    This method is what I use personally in my work.
    If you have your own strategies, feel free to explain them in the comments section below.

    >> Recommended articles

    About The Author


    Hello ! My name is Chou-Tac. I am a product designer from France. If the sketching methods I’ve acquired aid me in my life and in my industrial design career, I believe that they can also help you reach your design goal as a student or professional. My aim to help you all along with your design projects and journey. Anytime, feel free to leave a comment in the blog or send me an email at [email protected] : )


    • Chou-Tac

      Reply Reply September 5, 2014

      Hi Gautam,

      More articles and tutorials in Basic essentials and Design Articles are coming soon.
      Feel free to let me know about your progress.

      Thank you for your feedback.

    • Gautam Merwan

      Reply Reply September 1, 2014

      Good day sir,

      I am aspiring to become a designer. I just started exploring this site and I am already very appreciative of the kind of work you are doing here. I finished reading through the Basic Essentials and Design Articles (this being the last one) and I’ve already picked up on some useful information and pointers. This particular topic though, light and shadow representation in a sketch, is something I haven’t been able to grasp yet. I can draw objects but I have not been able to take them to the next level by adding the light and shadows to them to make them more descriptive. This article also remained a bit vague to me. But I hope that it would be discussed in a little more beginner level detail in the 365 K.S.drawing tutorials. I’m going to start with Sketch 1 today. I really look forward to learning many things from you, sir 🙂

    Leave A Response

    * Denotes Required Field