I worked as a digital editor for a stock image company and most images were not retouched by the photographers. Some photographers said that they do their "own retouching" but that always ended up a nightmare for the retouchers. My suggestion would be to keep as many Brands/logos out of the image and make sure it's well color balanced. Let the company do the retouching, they have 25 million guidlines to follow and it is easier to let them deal with them. As for a Duotone, nothing with 'EFX' would ever make it's way in as stock where I worked.
From the thousands of images I retouched none of them felt like the image you have just posted, but maybe stock photography has changed a bit over the past few years? I will leave that up to the stock shooters on G1 to answer about the content.
Anyway, nice model and fun images. I would have her work on facial expressions. Also, on #3 I would turn her face a bit for the nose shadow doesn't run past her lips. My favorite image is the last one, I would say 'lose the ring' and it's solid. Only my silly suggestions.