Hi anttik, this is a nice study, I'll tell you what I personally see. Proportionally, think the guy is a little bit too short, I don't know what your goal in this drawing is, but in terms of the value/tonal composition I think it's lacking. Every form is just popping out too much, there's contrast everywhere, if you want to improve on that I highly recommend that you watch this video by Steven Zapata, he addresses this issue with the contrast priority of a statue and he explains how you can change that contrast priority depending on your subject and message: https://www.youtube.com/watch?v=A7vqD56pYfU&t=5s I would also recommend using other references, New Masters Academy has great ones (because they have great light and shadow), looking at those references from NMA and at those bodybuilders like the one you used combined will help you learn a lot!

So i think this study is finished, on to anatomy. Just tried to up the contrast but im a bit too ad/hd to really do it.