Ahh the overworld is looking great! And yeah, not such a big deal about that splash screen but I do like the sort of half turn side look the frog does in the cover art, (and in the fan art picture), prefer it to the direct face on image you have now, just something about that half cape. So if it was up to me I would have another crack at it and base it on the other image but it's totally up to you and no big deal of course
And I was actually going to mention the pink hair thing myself. You know, maybe you could keep the colours how they are and it could be a quirk like that, because who knows if an official colour patch would fix that issue or not, they may have just looked at the in game art and kept it. It would actually put your own spin on it in a way choosing not to fix it, sometimes little mistakes like that are nice and gives things some character, as opposed to just making everything look perfect and exactly like the instruction manual and stuff. So yeah, I'm warming to the idea, maybe.
And sorry for when I criticise things, it's only because I want it to be the very best of course and because I know it's unfinished. Everything is looking so much better now
It's nice to see the progress you're making.