A useful tool to adjust for natural lighting is a 5-in-1 reflector. A personal favorite is the diffuser, but the silver, and white are very helpful as well with lighting a model.
The diffuser had to be held nearly straight above the model, because of the time of day, but it provided very soft light. The white reflector also provided a soft light in the profile shot. The reflector was held straight in front of the model. As for the silver reflector it was mainly underneath to match the reflection of the sidewalk near by.
Truth Be Told
Square One 