There are so many of Lego's own colors that they could use, like sand red, dark red, sand blue, sand yellow, sand green, purple, earth green, earth blue, brick yellow... There's no need to repeat colors, ever.
Did anyone else notice the box version of the driver is different than the one you have? I wonder, which version is more common?(I have the version on the box, which I got in this set and the hearse)
You did a good job with this.
I recently started making custom lego decals as well. I made one of the cyborg from series 3, and also a space man from series 1, since I never got one.
I also made my own designs for Blacktron and Futuron.