Nice way to practice, it is a simple model you could make yourself. Just one thing. On the legs, front part, there are two rows of vertexes oddly arranged. I believe it would be ok if they where in a straight line. On the back, the holes should be more round. Also I believe legos have the same size on all those holes on their legs. A side view would help to see everything better, from the look of those two views I believe you got the leg shape, body and arms right.
Yeah, I might just start over on the legs, the head and hands won't be that difficult to make (TBH I should've made the hands/wrists before bending the arms, an easy fix though)
I have a lego model to use as reference too on the size.
