animal_genitalia animal_penis balls big_balls big_penis black_balls black_body black_fur bottomless breasts clothed clothing contract equine_genitalia equine_penis erection female_intersex flared_penis forepaw_on_penis fur genitals gynomorph hair huge_penis hyper hyper_genitalia hyper_penis intersex looking_at_viewer looking_back looking_back_at_viewer medial_ring penis raised_tail side_view simple_background skunk_tail solo standing vein veiny_penis white_hair dakka mammal mammal_taur mephitid skunk taur greyscale hi_res monochrome
Ready for your transformation?  She even brought her own injector!

When creating bases prior to airbrushing, I've been adding 'sketch' to the base prompts.  Adds a lot more organic feel, and makes it easier to work with later.