Okay, first of all; what's wrong with this picture? What's good about it? Really, honestly- not much. It's pretty boring, and it doesn't tell us much. Sure, we see a cat walking down the street, he sees some food, he eats it, but behind all that is nothing.

Let's try something else. Color gives feeling; it establishes mood between the lines. The minty sage greens give a sense of peace, perhaps suggesting the cat really doesn't need the food desperately. It seems a bit empty*. The green could also give a sense of sickness.
*Note! Empty isn't the same as boring! It can give an eerie feel, or even a laid back one.

Now, this picture is very similar to the one above, but it still is a bit different. The warm colors against white make the ground seem inviting, and the sky seem desolate.

This picture seems to give a sense of sickness and fear. The yellows, grays, and greens make the cat look scared and miserable.

 Looks familiar, hm? What's different is that it's switched.

Spooky! The bright eyes and magic glowing cheeseburger against black make the cat look desperate for food, and the food itself look holy and important.