>Twitter circular avatar
Try mobile.twitter.com/realDonaldTrump, and you'll see a square avatar. Well, at least when I look at it, I get a square avatar (pic). Seems there's not too much to it – would think it's a formatting issue on twitter's side.
Not saying that there are no small differences: The missing blue checkmark is the most significant one from what I see.
Anons should have fleshed that one out last night, and as one anon mentioned, it might be because the pic was taken by someone logged in to that very account.
I don't use no twatter, much less have a blue checkmark – so I wouldn't be able to verify that.