I draw attention to the blog at http://thedragonhound.com/2015/…/20/anne-nevilles-portraits/
It is not mine, I hasten to say, although I wish it were. It contains not only possible portraits of Anne Neville, her sister Isabel and various other prominent ladies of Edward IV’s court, but also likenesses that may well be Richard and George. Maybe even Buckingham standing next to them, although that is my guess, not the blogger’s. Nothing can be said to be definite, but it all seems very likely to me. So many appreciative thanks to Dragonhound/Leena of Needletwig.
murreyandblue 
The man in blue could be Buckingham, because he looks a lot like the portraits of his son, Edward Stafford, 3rd Duke of Buckingham. He certainly doesn’t look anything like George, Duke of Clarence.
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