Lea, Think subject matter and their relative sizes and natural light. Photographing antique cars for example would require huge spaces but simple family portraits can be done in smaller spaces. One wall allowing in natural daylight is a plus in my opinion. You can always use black curtains to block the light if necessary. Also consider your ac outlets. The more the merrier and placing them high on walls or central joist beams can make things convenient. Take care, Gregory david Stempel FIREFRAMEi m a g i n g www.americanphotojournalist.com