Hey there OP! As someone who ran an etsy shop for a long time, I'd encourage you to look online for people who offer similar things! Base your prices around other similarly styled paintings, and adjust for quality, turnaround time, etc.
I'm seeing some pricing responses to this, and I have to say...to me, those are hard lowballs. They're citing the prices of a PRINT: a digital reprint of something pre-rendered. What you're offering is a hand painted canvas, and should be worth AT LEAST double. Again, check competitor pricing.
I'd also encourage you to make at least small adjustments to all the paintings you do. You don't want to get slammed with a copyright violation <3