Nose shadow is kinda strange...
Eyes have no depth. There is no variance in your line thickness... so, need to work on your line quality. It's really not much of a caricature, just a simple cartoon.
So, rating your "caricature" - I'd give it a 2/10... as a basic cartoon, I'd give it a 4/10. Line quality really makes your work pop.
Also, he's not doing anything nor showing any emotion. It's just a face with a shirt and half arms. No actions, no emotions, just bland. Colors are a bit bland as well. Needs to be more fun.