Welcome back!
some colors are "seen " better than others. as said before all go dark at a distance. my teacher 20 some years ago told me to make mine bright yellow with a med blue 6'' stripe LE to TE out towards each wing tip on top, and the fuse yellow on top and blue on bottom. do the tail similar to the wing but to eyeball scale. the wide tip stripe helps you see the bank or roll of the wing in a turn. I put a blue bar in the middle on the bottom of the wing to give me even more orientation. just don't make it look any thing like the top. there has been a lot of study on this topic and lighter on top, darker on the bottom with a "V" prominently striped on top pointing forward is a common result of the studies. I do this on SSC fighters and still have trouble in poor light . there are some new er neon colors and i have used 'em for fun but the sun will fade these quicker than others. i have used chrome.... it looks just like what it reflects and can totally disapear or flash sun light in your eyes. [:@]

good luck!