Mimic the art of Sergey Karlov https://au.pinterest.com/bronwa/mosaics-by-sergey-karlov/

It works but ... mmm ... what to say, 3 out of 10? in short, not the best. Lets call it V1 - to make room for improvement -.
starting the prompt by "made by rocks, an abstract painting of ", then something like a woman holding a pot of flowers or so. ZIT is actually pretty good making mosaic. The Lora is more like a guide.

Dont expect an artwork of Sergey coming out from ZIT. Sergey Karlov artwork are full of creative and ... dark mystery. No AI model can reproduce such level of artwork.