For game play, glossy models are fine. But for display, it is better to paint them to look glossy and have them matt sealed. Just photos better.
Yea, a couple of washes of green should bring out a green tint, but i looks like it needs much more highlights. Look at some of Giger\'s work, very little black, lots of gray and even white - almost as much white as black.
P.S. it is Giger. Geiger made a radiation counter.