Well, I admit this challenge is a tricky one. Only two of you have attempted it so far, but I encourage the rest of you to give it a go. It is an interesting exercise in observation. Remember, if the pencil in the glass doesn't motivate you, try something else in the glass - like a spoon or brush or flower stem or the like.
JH has drawn a very good version, paying close attention to the shape of the glass, the perspective of the ovals and the effect of the refraction of the pencil through water. She asked me how to draw circles in perspective when the top of a glass is wider than the narrow center. Basically the same principle apply as outlined on THIS page from a previous blog post. To achieve this as technically correct, you must create a smaller 'box' or square within the outer box. This smaller box will have the same vertical axis and sides will recede to the same perspective vanishing point as the outer box.
However, I generally find that if I get the outer box shape and largest perspective ovals correct, the narrower ovals can be 'eyeballed' to the right shapes. As JH has said she has done here - to a very good result! The top oval is perhaps a little warped on the front side, being rounder that the rear, but overall this is a good drawing and well observed. Nicely done JH!
Refraction by JH
KM has also drawn a good version of refraction in a glass. The ovals she has drawn are a big improvement over last weeks attempt. The top oval is a touch wonky, the back edge being rounder than the front edge - she has done it exactly opposite to JH above, lol. But the continuation of the oval shapes down the glass is very good. As she was observing the subject from a higher point than JH or my drawing, her pencil refraction is subtly different and angles off through three different planes, the pencil, the water surface and below the surface. Well noted KM!
The use of line, dark and white and minimal tones works very well, giving this glass a strongly graphic design feel. I also like how KM has switched the pencil about to have the point outside the glass, rather than in. An excellent drawing KM.
Refraction by KM
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