I believe Schwarzenegger's eyes are green. I just can't find the high-res Terminator 3 picture I found a few years back to support it. I'm sure there are other pictures out there that show his eye color... I just remembered that particular picture.
I have those kits too - have painted them, stripped them, semi-painted them, stripped them and am now in the process of painting them again. I always found their legs to be disproportionally long compared to the rest of the body and especially compared to the actors' physiques.
Have been looking for a long time for the Tsukuda 1/6 versions, but either they are only shipped to USA or they are too expencive... Their likenesses are way better, imo, and Arnold is less battle-damaged. I WILL get them eventually, but would rather have had them yesterday than tomorrow, if you know what I mean. .)
Good job on the paint-job. Very nice and life-like.
A suggestion: when mixing the skin colors, if you use water-based paint, then try to add some grainy gold color to the mix. That will give it a more naturalistic sheen. You can also highlight hair with gold and then apply a thin wash with the hair color you want... that will make the hair look more vibrant instead of just painted and lifeless hair. Have tried it with water-based humbrol paints and it works beautifully. Don't know if it gives the same result with other paint-types.