Go wide on this one, give that landing pad room to breathe. 640x512 should suffice on sd1.5, 1024x1024 or 832x1216 or somewhere in between on horizontal.
Trained on mostly profile shots, because whats the point otherwise?
==========================Illustrious=====================
Since illustrious is sdxl base, it's much more flexible, and not at the same time
Str 0.9 or so
gown, ruched fabric, shiny satin, bustle skirt, frills, ribbons, bows
ballgown, fine fabric emphasis, corset
obviously things prompted on the back have an effect on the "bustle-yness" of the back, so keep that in mind
===========================SD15=======================
However if you're looking for a compromise to facing viewer, and using A1111, you can use prompt editing
Str is pretty open, 0.6 to 1, depends on how hard you want to go. I think 0.7 is good.
[profile::1], [profile::2] or [profile::3] combined with (looking at viewer, facing viewer) seems to work best. With comfy I think it's { instead of [ , not sure. Just be warned when you do this it becomes less "bustle-y"
Please show me what you make. This empowers my Ted Talks