I think you met the challenge with this photo. A little humor can be fun :) I think you may have been able to improve this image with a little stronger or more light in the room. I can't really offer you much for improvement here.
This is very funny; though staged, it's one of the best surprise scenes. I think it might have been better cropped a little at the left, and had a tad more sharpness. If you had someone there to help, some fill light on your face would have really emphasized the surprise! Good sense of humor. Now we want to see the bald shot! ;)
Not a good thing, that's for sure, LOL! This would believable for me if I didn't use Nair myself and know that it didn't suds up like that. But the concept is good, the expression is almost realistic and the woman is very brave for letting you shoot her in a towel, I know I wouldn't do it, LOL!
Nice staging; from all I've heard of Nair, I imagine that would hurt like a mad thing, too. Very effectively disturbing - I was holding my hair tightly when I saw this and just wincing. The bit of suds in the upper left is slightly disturbing, even as it gives context - maybe showing a bit more of the head would have worked better?
I don't know what Nair is but I guess it is not a shampoo ? The image (at least the bottle) does not seem to be totally sharp. Could have cropped a bit of the left side of the image.
*laugh* I had to look up what Nair was, I hope others realise it. Focus on the bottle could be sharper but overall I love it. (Hope this doesn't appear a second time, I had already typed this and voted but pic came up a second time)