Cartoon Avatar Head Swap that will be VTube Studio Ready for 3D Avatar gaming

I already have a body that won a previous contest; now I simply need a fresh head to sit on those shoulders. Keep everything cartoonish so it blends seamlessly with the existing artwork, and give the character a bright, unmistakably happy expression... (Budget: €8 - €30 EUR, Jobs: 2D Animation, 3D Animation, 3D Modelling, Adobe Illustrator, Adobe Photoshop, Character Design, Graphic Design, Illustration, Illustrator, Photoshop)