This one, I just did for fun. Someone on Ic's image board posted this picture below so we could try to make a study of it. I don't know who this picture belongs to, but I think it's great.
It was a fun drawing to do, but I realised only halfway trough that the canvas I was working with was way too small, that's why the image is all blurry. I also don't like the shadow, but honestly, I didn't know how do it. But overall, the picture didn't turn out that bad.