Ran the CLIP interrogator on the Ingres painting and used it for Reference CN, weighted fully towards CN.

Took my favourite version that came out, and ran it through MultiDiffuse upscale with NMKD Siax 200k and NMKD Superscale Artisoftject 210000 G, at noise levels ranging from 35 to 55, then blended my favourite pieces together in Photoshop and made adjustments.

Halved the image size and blurred it, upscaled it with MultiDiffuse again, made more adjustments, and repeatied the process until I was happy with the result.

For fine grained adjustments to the neck and hand I used img2img with lineart_realistic CN at a weight of 0.9 and a denoise ranging from 35 to 55.

Princesse de Broglie by Jean Auguste Dominique Ingres 

Thanks for looking!