I agree with what has been said so far. Also I think you could change his posture. The interaction between the head and the flag is kinda lost. Now if he was looking off to the moon or something then his pose would be fine. Being that he is the only survivor left I think a foreward arch would better suit him.
Colorwise the second one makes more sense to me since the emotion fits better. The 1st just seems like the red comes out of nowhere and the gradual transition is too abrupt.
Overall I like the character and the setting. Just a couple of things you can work out to make this a really good pic.