you should outline wiht black or dark grey or dark brown the transition among 2 light colours, for example the blue of the details and the white of the armour. If you add there a very narrow line, very thin, then the final ending'll be much better. try to shade also more the faces, and would be good to paint the sand/rocks in the base with a pair of layers of drybrush, so it stops looking so natural (for me its better to paint everything) Hope to see more things of you here in cmon! cheers, albert