Solid color choices for the most part. I think your backgrounds are coming across as a little more haphazard than they probably should. I'm finding it difficult to get a sense of the environment from your backgrounds. Skipping from yellows to reds to greens to blues isn't helping to establish a mood when it's done randomly. Rather, you should look to do something like that to add effect or emotion to a particular panel. You did a solid job of establishing the scene in the motel panels, but the Superman and the Batman panels are all over the place.
Also, every single color you use is way saturated. In some panels it's hard to figure out what is dominant. Mixing it up a bit would greatly help you. For instance, that Superman speed streak would look a whole lot more realistic if the reds and blues were washed out.
And another thing, judging from the shadows that first page is supposed to occur at night, not blazing dawn.
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