Studio shoots can be scheduled at any time of the day since the the lighting and climate are controlled and you are not at the mercy of  Mother Nature. (Not that there is anything wrong with Mother Nature) Don't want to tick the good lady off.
However many agents prefer that head shots be done outdoors. So, knowing how you are going to use your photos is important before making your appointment. But everything is possible. Nancy has a technique she calls ,"indoor - outdoor lighting". It's the illusion of out door lighting in the studio. Ask her about it if you're not the outdoor type but need an outdoor look to your shots.

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