Hey,
although the brushwork itself seems a little bit rough (at least what I can see based on the quality of the photos) the colours/tones you have used fit together nicely - which I find more important than super-clean brushwork. You even did blacklining, though I'd not use pure black but more a very dark grey. Black is often to 'hard'.
Concerning the bases, I agree with Butch, though in this case, they actually don't bother me as much. They kind of work for the chosen colours and the terrain. But the yellow(ish brown) would stand out too much on a grey terrain board for example, or if you used different colours, like blue, on your minis, it would probably look weird because of the contrast.