Hmmm, I dunno. It still looks like his torso should be leaning forward a bit more. I think it's because his head/shoulders are so bulky compared to his very skinny body. I imagine his center of gravity must be way up near his chest, which still looks pushed back compared to his feet to me. It's probably fine, though. He's not glaringly off balance or anything, he just feels a little off when I look at him. Actually, that's probably it; he doesn't really look like he'd lose his balance just standing there anymore, but it still feels like if I gave him a solid shove, he'd fall right over. I think someone with such a bulky torso and such skinny legs should be hunched over/crouching down a lot more, to lower his center of gravity. Here's Zangief of Street Fighter fame to show what I mean:
Now, Zangief has large legs to match his large torso, so he'd probably look pretty good standing up, too. But your fish guy looks top heavy, so it's even more important for him to take a solid stance, methinks.