nice work, Just as a little tip, maybe give him a bit more variation in details and bigger planes. This way you can create a focus on one thing in your character. For example: The legs and arms have more details and more things going on than the helmet. This looks a bit all over the place.
I'd suggest to simplify the legs and the arms, and focus more on the chest and the head (Which seem to be the main focal points to me)
As for the color, I would suggest going with complementary colors, or with colors out of the same family. Red and Blue can work, but red and green, blue and orange, purple and yellow work better. Of course you can do whatever you want, it is your character.
I just thought I'd give you some serious feedback, since I see you a lot on the forums.
Which is really cool of you.
keep it going!