Lighting set up practice

Yesterday I had a studio to practice what lighting I wanted for my final shoots, I knew I wanted a white backdrop, but I wasn't sure whether to have it bleached out, or just light the subject, to have shadows in or not...
So with help I set up a few different lighting set ups, they include using different size soft boxes, a beauty dish, and lights with no attachments.

Ok the first set up was to bleach the background out.

These are some images I have cropped that came out of this set up.

I'm not sure if the shadow works on the images that have the model on the floor in, I didn't want to model to appear to be floating.

The next set up doesn't bleach the backdrop, instead I opted to light up the subject and to create a shadow.

In these I had to paint out the dirty marks and fiddled with the contrast slightly, and I like the shadows on the backdrop, it sets it apart and makes it appear more three dimensional rather than flat.

If you have any comments please let me know, I may try both of these set ups in my final shoot and then print one of each to decide which I prefer.

Community center test dance shoot

Finally got chance to take some more images of dance, this time I used a real dancer. I only had about an hour to get some shots which included setting up and costume changes, and I only had a community center to have some space so the backgrounds are not what I want to use but I wanted to try out real dance positions. The lighting wasn't strong enough to capture a completely sharp image and so I had to have a high ISO so that I could use a wider aperture and faster shutter speed.
Here are some of the shots I have taken, some have been edited to get out chairs and corners of rooms but will still be going in my journal as research.