It's The Italian Job all over again! I read about how you added in the green and purple Minis. It takes a lot of skill to be able to imagine the perspective and angle that the cars would be at, take a different pictures, and, of course, edit them into the original. Do you draw in your spare time? I think most people that didn't would screw that up horribly. I am in love with the mechanical drafting class at school, so I'm so good at perspective that I can't satisfy myself unless I have a ruler to get the lines correct.
The green Mini looks spot on. It's very convincing that it's turning and heading for the stairs. The purple Mini looks a little odd, too foreshortened, but I'm not really sure how to fix it.The placement is good; it looks like he went a little too fast down the steps and is sliding to his left while going down. But the change in width from the front of the car to the rear is too extreme. If realism is not the object, though, and Minis chasing each other down stairs and through subways is definitely not realistic, then the two stragglers are about perfect.
I really like the bright tree colors, though the yellow tree to the left is too bright and washed out. It detracts from the yellow Mini. I think if you had made the reflections on the yellow and purple Minis a little brighter they would stand out further, but then again they are shaded byt the trees. I also like the shadow on the sill of the yellow Mini; it shows that the side is curved very effectively. Maybe a little too effectively. So I'd say just turn the contrast of the yellow tree doen a notchertwo. I also read that you changed the colors of the stairs and the yellow Mini a little. I couldn't tell before I read that, and I still can't! I do see the tint you're talking about, though, its on the building, and I never noticed it before. I love the stationary caliper behind the front wheel; there has to be a complicated process to seperate the two after the radial blur.
Did you enter this in the photoshop comp? I haven't checked yet, I've been busy with der schule (semester finals and such) lately. Oh, and, add another to the list of who uses it as wallpaper!
Your "color shifting" pics, in real life, would probably be called pearlescent ot chameleon. They actually, back in the day, anyway, used pearl powder in paint. It would add a yellow hue to the base color, depending on the color it's self. You can see it on the earl whites fro Caddillac and Lexus, especially. Those whites have a beyond-mettallic shimmer and are a little yellowish. Mixed with red, it would look orange, green with blue, it would be like mixing a little yellow with any other color.
Take TVR for example. With the Speed Six, the Chameleon Orange would most likely be a red base color with a clear coat on top that has a lot of pearl effect in it. Hence the orange tint in areas. The Chameleon Blue also has this yellowish clear on top to give it a slightly green tint. Flip Flop Yellow looks to me like an already metallic silver with a heavily saturated pearl clear on top. The metallic effect on bottom and the pearl effect on top work together to make the paint really pop and shimmer vibrantly. In contrast, reflex, or color-shifting, paints actually have multiple layers of paint, many different colors, and usually they're metallic. These colors are very thin, though, mixed with some clear to make them a lttle translucent. In modern paints they go so far as to have different shaped crystals in each color so they capture light differently and pop in different areas. But that's in real life. I think PD screwed up a few colors, like Blue Pearlescent, because that color appears to have no shimmer at all, which is unrealistic. Good job at making pearlescent paints, though! They look great if labelled that. And you are just acceptional at swapping colors. I can't even see the cut lines.
Forgot something: These colors you've created would be a good base for a great looking color shifting paint. Take an airbrush and lightly add a poofertwo of red and green to blue, or blue and yellow to red, or yellow and red to purple, or red and yellow to green.....