Probably one of my favorite of your drawings as it reminds me of Bionicle and brings back good memories.
Anyway, I think you did really good on the drawing. Coloring looks nice, the drawing itself looks good. The only thing that needs improving would be the detail of the length and height of the drawing. It looks a little scrunched down (I can tell that you don't have room to make it bigger so the above statement really doesn't have an effect) but besides that it looks really well done, I'm impressed.