First, welcome to DPS!
Second -- about sharpness -- I really can't tell at this size. The forum HEAVILY compresses images -- you may need to post a link to flickr, or some larger size.
Third -- colors. Wow, those are intense. I wolud call them "unrealistic", sort of like they're in a children's picture book. On the one hand, I kind of like the effect. On the other, I feel like you have overdone it. I think that the only way to decide between these two options is to know what YOU intended. Going "over the top" is a very valid artistic option -- but did you want that, or did you just bump the saturation a lot?
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