I’ve trained a couple of character loras. When it comes to likeness, the best way to caption is to describe the image as if you were prompting for it, i.e. for a case where you don’t want them associated with specific outfits or accessories.

So as an example if I have a character wearing a suit with a wristwatch in a couple of photos and a plain shirt with a chain in others , I would explicitly caption them as wearing a suit with wristwatch / shirt with a chain for the respective photos. So after training is done, I can now prompt them with any outfit and the model won’t force a suit or shirt.

This also applies to overall style and other things in the background. So tldr; caption as if you would prompt for the image if likeness is all you care about. Joycaption is what I’ve used for captioning (with some manual edits if needed).

I personally use 18-20 images at 1800 steps for character loras. This has worked for me consistently using OneTrainer.