I would try to set aside your opinions about the ink and hardware. I think it's safe to say that MOST girls who are into pinup culture nowadays are going to have at least a few tattoos.
Related: I have a "tattoo enhance" preset for Lightroom's adjustment brush, if you want it.
I found this to be very useful, despite the silly cover photo. It's not the be-all-end-all but it's got a lot of good tips and is worth the price. Both you and the model should watch it:
Still, it takes a lot of practice. Giving pose direction is maybe the hardest part, and just takes practice and experience. Ask the model what she likes most about herself, and play to those strengths. Also GENTLY ask if she has any areas of concern (double chin, soft jawline, cellulite thighs, wrinkles, upper arms, etc) and try to conceal or work around those areas.
For kneeling poses, the model should NOT sit all the way back with her butt on her heels. This will squish her out in odd and unflattering ways. Look at the kneeling images in the threads you linked, see how her butt is a good 4-6 inches off the heels? one inch at the minimum. It's a hard pose to hold.
Facial expressions are absolutely key for this kind of photo. The model should start practicing NOW making faces and expressions in the mirror. Not every face works for every person. Some girls can wink, some can't Some girls can bite the lip, some can't. Practice emoting with the eyes and eyebrows WITHOUT wrinkling up the forehead - forehead wrinkles are unflattering, and you can maybe 'shop them out but it's a hassle and often won't look right. Surprised, playful, sly, pouty, angry, apprehensive, sultry.
A big white paper backdrop will give you lots and lots of options.
A few props, too - you don't have to go all-out with a full set; the emphasis should mostly be on the model. A barstool, a retro tabletop fan, a retro mixer or rolling pin, an old suitcase, a little ottoman or footrest or stool, a retro ice chest and some glass Coke bottles. Look in junk sales or vintage shops for this kind of stuff.
Ybor Studio 1701 just changed names (and owners? dunno) to Sun Spectrum studio; they have space for things like this, lights and a few props, and they're very open to this kind of shooting.