This suffers of too many fundemental flaws to continue with in my opinion. It's too flat, the colours arent well picked, it doesn't really look like a pig, and so on.
I'd say redo the entire thing, and pay more attention to how a pig and a human actually look like, and how they're coloured.
Here's a suggestion:
(Don't mind the jagged lines, I'm just too lazy to remove em)
I added volume to it, more accurate colours, more realism. And I still kept it cartoony. It's a quick sketch, but you get the point I hope.
