(Original post by TheSownRose)
Is it meant to show a city on the moon? If so, you've made the earth far too big - that's what stood out when I looked at it, not that the landscape is obviously cut and pasted.
It's supposed be any planet but I guess it makes more sense that it would be the moon.
I think one of the issues with the landscape is the lighting. It's well lit in the middle-distance but dim in the far distance, and doesn't obviously conform to any believable light source. Given the position of the terminator on the planet (I don't think the size of the planet is a problem, artistic license can afford the discrepancy) the city will have to be in night - choosing a better source photo of a city's landscape at night might really help.