I don't think you fail at it!

Anatomy-wise, what is standing out to me is that his legs are too short, both from hip to knee and from knee to ankle (especially the lower half; while factoring in foreshortening, his foot should still be in a slightly different location).
Also, his left arm (right side of the page) appears to be longer and thinner than his right arm, while it should be slightly shortened comparatively due to the angle we see him from - his pectoral on that side would need slight adjusting accordingly.

I don't mean this in a rude way at all, it's a good start and I like it quite a bit so far! Good luck in continuing if you decide to finish =]

Ah thank you! No, please, don't think it's rude at all. :3 Sometimes you draw something and you know something is off, but you can't tell what, you know? So I'm really happy you responded with that critique, the simple fact that you did inspires me to finish the pic. :3
I'll continue working on this and hopefully I'll end up finishing it soon. Thanks so much for the critique, I really appreciate it. :D <3

I definitely know, a second set of eyes is the best .__. I just don't want to come across as insulting, only encouraging!