My whole apartment/studio is 25 square meters and my studio i use is between 7-8 square meters.
The biggest problem is the height of the roof. My solution is to run flexLED panels for my portrait.
I got more control on how the light shape the face and have more time to work with my model.
LED i use on this portrait - https://goo.gl/PUfQ9X
How big is your studio?
Nice portrait and ps.
good portrait