The two drawings below were created mainly by observing.
This was supposed to be done in 2 hours, by observing the glasses laid out in front of us. Below is a picture of the glasses as I saw them.
This was supposed to be made, on an almost A2-sized sheet, using grids. We were given around a day-and-a-half for the same! Below is the original picture from which the above was to be reproduced.