Ariane and Erica. Me like. Me like a lot.
Why don't you try the girl from the tankstation instead of Rebecca? I'd personally rather see her naked than Rebecca. Just my preference.
Did I already say you did an amazing job? No I didn't. Well, you did.
I have no idea where to start on the dress, so odds are I won't be able to use it.
No need to copy the dress. She could use something new.
Her top on the first picture looks good, though it could be cut a bit lower and also show some of her belly. That would look sexier. Maybe a different colour to distinguish it from the original.
If you want to copy the original top.
The original has smaller straps, shows more cleavage and her nipples, is a bit lighter shade of red and it's tight on the bottom, it doesn't wrinkle there. Hope that helps.
By the way I also noticed in the original there is often a bit of light reflection in the eyes (especially in the close-ups.) This helps a lot to make the eyes look more alive. I presume that would not be too difficult.