You got the idea down. Keep at it!
His eyes are a bit big tho, and there should be more detail on the mesh to make the helmet bumps look cool. Also, the shapes should be more smooth in general and that eats away from the look as it gives off an unintentional "sketchy look". He also looks a little off model because of the general proportions of his head where his helmet should be more sphere shaped. Also seems to be missing the ear pieces.
I do think this could look cool if you did the whole character model and fixed some of the issues, though. I kind of like the texture work too.