I would suggest correcting the gesture on the ninja turtle who is running. Typically, a bipedal running figure has alternating limbs. With his right leg swinging forward, it should be the left arm that is matching it, rather than the limb on the same side.
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That said, I really like the gestures of the two middle turtles. The one in the front and the back, I would rework. I also like the stark contrast of the street lamp clearly illuminating just that particular section of the street. That clean line of demarcation from light to dark appeals to me. Very comic book style. I would not recommend changing that, as others have suggested.