looks cool so far! what I would suggest is to decide on a light source, and paint the model accordingly! that way, you can turn the forms in space with the texture really nicely, for example the shoulder armors could look like they are being lit from above, and you could feel their roundness. Also with the face, try and…
its looking pretty good, very neat thats for sure! Personally I think you may have lost quite a lot of the angular joe mad style, the silhouette is looking rather smooth and soft. Also his proportions arent as heroic as the concept, for example his shoulders should be further apart, his torso more of a v shape.
For some reason I've only just seen your thread >.> I think there is some really cool stuff on him I like and overall your doing a good job, your painting is improving from your first character for sure :) I really feel like some big areas that would help push this to the next level is more chunkiness and aggressiveness in…