Wantes to work only with one light, a canon 550EX with a 60cmx60cm softbox.
After playing a little with the power and position of the softbox this was my results.
1st photo softbox infront of model.
2nd photo softbox left of camera at 1/4 power
3th photo softbox right of camera at 1/16 th power
4th photo softbox left of camera at 1/32 power