Her eyes are amazing, I don't think you could do anything to make them any better!
The only part of her anatomy that I would say needs a little work is around her crotch area. She has this lovely big bushy tail but a gap between her thighs where you can see the sky. It gives the appearance that her tail suddenly thins dramatically behind her or that it is slightly off centre. Seeing the fur of her tail between her legs rather than the sky would continue the full look of her tail. As for the crotch area itself I can't decide if it is the shape of the swim suit or the shape of the crotch but it seems a little too rounded to my eye, like it needs to be ever so slightly elongated.
This is amzing I love the color the eyes an the tail is awesome the water could be a lil better but u will get it the anatomy is perfect I'm my mind the reason I say this is bc unlike most ppl u have ur furry with properly proportioned breasts an legs what u have to remember is that the fox is a naturally slim creature so it only suits to make the anthro the same this is a great job an I am very impressed I do hope u keep up with this anatomy bc it makes it a lot better believe me fantastic job u fail to disappoint me I <3 it
I alaso watched ur video on speed drawing flame in invaders must die now I respect u a lot more now that I know how much u have to go through in drawing very talented ur too good for ur age u know that lol keep it up an don't give in to the belife that bigger boobs r better bc they r not XD