You've come this far and IMO may as well throw a bit of money at it to do it justice. Better to know you gave it a better shot than wonder what might have been. I once bought a domain and mocked up wine tasting notepads to see if there was a market for it, then I barely showed anyone and it predictably went nowhere.

I'd get some professional photos done with a couple of musicians as models. Upgrade the site. Set the cheapest pricepoint as $30ish for a three-pack (and maybe a bulk option for schools/teachers?). Then try some Instagram/Facebook advertising either as a one off, or with a $50/wk budget.

Then, after a few weeks, if it's had no traction, make a decision to proceed or bail. But at least you will have given it a bit more effort.