Building OnlyFeets: Testing AI-Powered Custom Image Generation for Niche Interests

Hi Indie Hackers,

I’m an indie maker who recently launched OnlyFeets, a web app for generating custom foot images using AI. The idea is to let users describe what they want (pose, style, etc.) and get unique images instantly.

I’m still early—no paying users yet, but a few testers have tried the tool.
Curious if anyone has experience marketing or monetizing very niche, “long tail” AI products?
Happy to share my approach and lessons learned.
Any feedback or advice would be awesome!