cartoonish characters actually aren’t that easy to rebuild in 3D. but it already looks a little bit like Rayman. maybe make the nose and mouth seperate objects. Then you can better organizethe face parts. But if you want to keep everything connected as one part you have to resculpt some parts. The mouth should be just a flat plate under the nose and the head part behind the eyes is a bit to thick. i wish you good luck with that one