so here are my 2 Cents on the topic:

You shouldn't be trying to shoot big Art here or do some kind of Fashion-Show with Your models - instead focus on the Funktion that the Photos U are taking are going to have on a webpage or an advert; think more metaphorical style and in symbolism... don't try to make your Photos too realistically; and finally: make those Photots brighter with richer colors.
Just try to think a little bit more like a salesagent and a little bit less like a Photographer
...then I guess You'll be doing A LOT better!