REUEST: anyone knows if there's a site that makes these kind of image transformations easily, or if there's a name for this technique so I can read some tutorials.

@MechaSilvio its the img2img tab on automatic1111's stable diffusion UI
You place your reference image in, and put in your tags as normal, and have it generate something visually similar to the reference image.
Lower the denoising strength if its being too creative while generating.