Escape the World

Will this is my entry. Wish me luck. This actually reminds me of Peter Pan If anyone can give me constructive criticism on the colour scheme, whether I should keep it just green and black or have some other colours thrown in like here: [link] I'd also like thoughts on the composition, with the relative size of objects to eachother and their placement. Anything else I'd be very grateful.
I was debating whether or not to add some brighter stars because at the same time I guess I was going for some kind of realism. I was also debating whether I should add clouds to the sky and/or keep it a simple black.

Stock

Help from these tutes:
Aurora borealis [link]
Reflection [link]
Moon: [link]

Ship [link]
Cliff: [link]
Man: [link]

Star Brush: :iconcaedial: [link]

Done here as well [link] and [link]