Using Blender and Photoshop, and a couple youtube tutorials from @Sheasu, I have finished my final design and improvement after I posted my first blender GFX.
The red and white band in the background are a bit pixelated, you should try the pen tool (If it’s not the tool you used)
Add some shadow it can look super cool
Why not trying to add color corrections ? For you can install the plugin Camera Raw, Bullet Looks (It’s a Sony Vegas plugin but they have also an app that you can use for add color corrections), make it by yourself or use a color correction pack from a graphic pack. (Me i use the CC pack of the Jelly Pack, by Jelly Brush, it cost 10$)
A would recommend adding an area light behind the character to avoid having those dark shadows on the back and have rim lighting which usually makes renders more interesting.