Rui,
You would get better results on the shadow side if you use a reflector.
This can be a piece of white foam board strapped, clamped, or mitered to a chair. I have in my bag of tricks a sun blocker that people place on the dash board of their car. In the states we would find them at an auto parts store or even at some grocery stores where I got mine. One side is white the other is silver. It rolls up and is very light weight. It works fine if you have another person to hold it, otherwise you're back to whatever you can devise.
You may also try a shadow-side soft light bulb that you could clamp to a chair or stand. As far as the type, wattage, color etc., I'm not much good at that stuff.
These are just the simplest of measures, however, they can help your cause with minimal expense.
You may also find it helpful to read through Will Enns Husband/wife compositon thread in the composition section.
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Mike McCarty
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