Help with latch

So I have a 3 week old baby and I can’t tell if it just my nipples toughening up or if the latch isn’t quite deep enough yet. Both his lips are flared out but I’m not sure if his jaw is wide enough?

what should breastfeeding feel like?

It’s so much better than the first two weeks but sometimes it still feels still feels pinchy or raw when he’s eating? It’s hard to describe. It’s not as painful as it was at first but it’s also not always comfortable. So what should it feel like when it’s correct?