For the first one: Black cars are generally hard to colour. I think you've done a pretty good job to get it to that colour. If you wanted to change a yellow (just a random example) car to another colour there are a number of ways to do it. 1. Desaturate and then go to colour balance. 2. Hue/Saturation and play around with the Hue or 3. Simply brush a colour over the paint and turn down the opacity or play around with the layer blending options (this could work for the black car)
For the second one: boroboyben is right, but png's are better for that kind of thing. Just make sure that if you do it in photoshop that when you save it "interlacing" is on.
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