Your colors are fine. I have few rules I follow but this is just what I do, I don't think there are rules in the scrappy.
I won't put the same fabric right next to each other and try not to put them in the same block if I can help it.
I do a lot of starching and pressing. When I do a scrappy strip quilt and I square up each block.
I try to make the last piece on each corner a larger strip because when you sew it in both directions you lose 1/4 inch on each side and if you use a small strip, you can almost lose the fabric in the seam. Most of the scrappys I've done I control the color shades but I'm doing an off the wall one now and I love it. Your is looking good. show us more when you get more done.