If they're natural there's nothing odd about that. These type of comments cause many easily swayed women to have so many body image issues they waste years of their lives with eating disorders and dieting. Chill out.
Sorry, but I must disagree. They are disproportionately huge in this picture.
In my opinion, it's pictures and photos like this that cause body image issues - things that seem realistic and attainable, because the viewer feels like they share similarities with the person in the picture, but actually aren't naturally possible for most people. I know a few women who have had breast enlargement, or want it, because they've been bombarded with pictures of huge-titted women for most of their lives, and think that they will never be good enough until their tits are as big as their head...
Guys like Jim Lee and Andy Kubert drew Psylocke --- no, scratch that, nearly ALL mainstream comic artists draw their characters --- with ridiculous proportions, but at least they never pretend to be realistic. This is a semi-realistic figure - until we get to the boobs. Look at pictures of some muscular, slim, toned female athletes - women with a waist this small - and tell me if their boobs are even close to this size...?