I looked at these several times before commenting. Most are a bit too suggestive and naughty for me.
I like #4. it looks like you planned the heavy shadows and they really work in this scene. My non-technical imagination forgets the back of the chair and thinks you surprised her in the tub. Give it a snappy caption.
First one is good. Good idea. It´s a must have in your collection.
2nd: Good but the label on the lingerie stands out to me. Ever little detail counts.
3rd: Great. Looks unique and is a strong image. Makes you think.
4th is too candid for me.
5th is quite confusing. Too much blanket and not enough nude but i like the direction in creativity you are taking.
Main thing is you keep trying and find some experienced models. Two minds are better than one and all that.