The image training in Leonardo with the free version allows only one "set of models" per month!
But you can make a kind of training on the fly by putting several images as here!
There I put only 2 but you can put as many as you want (max 30) the ideal being 8-15 according to the FAQ! https://app.leonardo.ai/faq
Yep, formally it's "Dalle.e"...any regulate just a prompt and press Enter!
Free and infinite! Only one format 1024x 1024... https://www.bing.com/create
I truly do not understand the obsession people have with these AI tools. I've tried Stable Diffusion and Invoke.AI. I find I waste too much creating prompts and would rather spend the time creating art in Rebelle 5, Photoshop, Painter or 3D tools like 3D Coat, Groboto3D, DAZ Studio or Moi 3D.
Hoping this obsession with AI generated 2D art quickly dies a quick death.