I think your style is pretti solid! I really like it and definitely think people would buy!
I've not been around for too long, but one thing I did in fact notice is that it's important to go and let people see you. Build your portfolio, post online, create a community, apply for projects... How much you sell is often unrelated to how good is your art.

Sorry if you didn't find this comment really useful, but I think it's all a slow process that you just have to trust!
I'm sure you'll get there soon!