He is beautiful! All ringnecks I've been around seem to "bow" when they want to play or have their head rubbed. As far as the blue and green color goes, I belive that means he is green "split" blue so could have blue or green babies? Im still learning the genetics myself. My girl is white (albino) and her brother looked just like him.
The only mutation that shows up visually when the bird is split is pied, and it does not show up in all species. Budgies and cockatiels have the tick marking most often on the back of their heads indicating being split pied.
So... for a bird that's visually blue and green in that manner indicates that they are a par-blue mutation... neither green nor blue, but turquoise or aqua - mutations that are in the middle! It simply means that yellows, reds and oranges will be reduced, so the bird will appear more blue in coloration, however, those yellows, reds and oranges are still there, to a lesser degree. You end up with blue-green birds or seafoam green or some other color combo in the middle.
Your IRN is almost exactly the same color as my little guy! Like my little Socrates he seems to be a cinnamon turquoise/ blue mutation as well. So if it is the case, the two colored feathers thing is just the mutation.