to keep close to her old design try any of these - or put in Neg ( when altering appearance/outfit)
may need to add 3d, or realistic, in neg for certain 2d/anime styles - lower weight for less 3d influence - 0.8 between 0.6
PonyXL version may need a XL VAE as a 1.5 VAE may cause issues - Images may be - at or past 1024x1024 or 832x1024 - Sampling steps past 30 - this can work with any model that is PonyXL or was merged/trained from it - realistic, or anime, in prompt may help - DOES NOT WORK WITH 1.5 checkpoints - TW is Luisaxl,
For appearance
Luisa, brown hair, brown eyes, - hair bun with red ribbon, or hairbun,
adding muscular, or biceps, may increase her size further
for attire
white shirt, or white top, (long blue decorated skirt,) or blue skirt, blue sandals, bracelets,
skirt may turn white or be shorter than prompt - add weight or put it in NEG