It’s very tricky. I’m not saying that the background changing is what made the big difference. I’m all for varying backgrounds. It’s more about keeping some sort of consistency or a tie in from one image to the next. I think it’s more of an issue of treatment of the photos. You went from a very flarey image to something with a lot of contrast. It was a pretty big jump.
Check out this story in Vogue Italia shot by Paolo Roversi. The caption at the beginning basically says that she wasn’t trying to be a sex symbol but the media made her one. She embraced it and took advantage of it. She’s wearing Dolce & Gabanna in every shot. All the photos look very different but the consistencies in light and mood all remain. That is what you should aim for.