First of all, the two lenses you mention, I would not waste my money on as you'll wind up with something you don't need for glamour, beauty and the nude photos. If it means saving up for six months, then wait and purchase the right lens. The lenses you are asking about are too "slow" (f/4.5-5.6) and obviously at that price are not the best glass either.
What many people fail to realize is that lenses with that type of aperture cause many issues like a darker viewfinder than a lens say at F/2.8 would give you. A F/2.8 lens will give you twice as much light in your viewfinder, thus making it brighter and easier for the camera to focus. Cameras struggle with focus when lenses of F/4 or higher are mounted especially in low-light conditions, such as sunsets, or even darkened studios.
Marketing hype has made it where people say, "I don't need a fast lens as I don't plan on shooting in low-light conditions so I'll settle for the F/4.5 slower lenses." In reality when you do this, you suffer with darker viewfinders, the camera takes longer to focus and cannot focus in all conditions and you get lower-quality lenses and glass and of course you won't have a lens when you do find yourself in low-light conditions and need one.
If you're going to shoot glamour, beauty or nudes, think about at least a "prime" lens like the 85mm F/1.8 or something from the 85mm-180mm range zooms, the 70mm-200mm is fine but make it the F/2.8 model, nothing less.
On another note, if you need to borrow my lens at the workshop, I have no problem loaning it to you for the workshop provided you take care of it during the workshop. I have an 85mm F/1.2 and the 70-200mm F/2.8 image stabilized (USM L series) lens. These are my personal lenses I purchased so you must ask me immediately before someone else asks first, though you'll only need one of the two. Personally I use the 85mm the most.
I hope that helps, thanks, rg sends!