add zeke2 training images

[zeke]

This PR adds a new collection of images for testing fine-tunining on human faces.

It expands on the existing zeke training set that @fofr and others have been using to test Flux fine-tuning.

Everything's a JPG. Variety of filesizes and dimensions. Mostly just face without too much background stuff.

@fofr @lucataco @zsxkib @daanelson what do y'all think?

[zeke]