Critique this for me please

I designed my moms tattoo and one of her costumers saw it, asked who did it, referred to me, and now he wants me to design his. I know my art is my art so I can’t help if he doesn’t like it but I don’t wanna let him down. Any advice?

(This is like a rough draft so the lines will be cleaner when I redo it. I was kinda just trying things out here)