Did a few doodle-pieces two days ago, but this one was the only one upload-worthy.
The idea behind this picture changed a few times as I was drawing it. Originally there was just the small Czech pun. Then I figured it would make a good reference sheet for technically inclined furries. In the end I decided to use it mostly for improvement.

So, whatever you think is wrong with this picture, point it out! No matter how trivial it is. Also, if possible, say how is it wrong, how would it be right and perhaps tips on how to too.

With enough comments I might continue past the pencil sketch too.