Super cute! And as someone who's been doing AA for a couple years now I will tell you keychains are basically how my partner and I pay for booth and hotel costs
I think the ONLY advice I could give (because I love your style so much) is to be careful with the proportions. Usually keychains are circular to egg-like in their shape, and sometimes long/tall dimensions on keychains look a little weird (they might come out too tall, or too stringy if you try to shrink). I love your art style though! So instead of trying to change it, you could always add some stuff in the background to fill out the width a little more!!!
(This is also a personal thing; out of the keychains I've made I feel like the rounder ones - be it by character shape or having background design - look cuter)
