My name: Jin Wu taught himself to sketch, and he painted decently. I want to sign it later. Who can help me design it? In his thirties, he can't even draw.
You should also strengthen your understanding of the structure of objects. You don't have to design it if you sign it. When it's designed, it's not your signature, but something that someone else added to your head. You can sign as you like. But for the time being, I suggest you practice your basic skills again. I can see that you like painting, but come on!