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You should put a black curtain behind your backdrop, your window bleeds through in a lot of shots.
I wanted to come back to this for a moment and state a few things clearly:
When using flash, you can use the power of the flash as a separate control if power is adjustable.
You can move a light closer or further away to affect brightness on your subject.
Light falls off very quickly close to a light and falls off more slowly as you get further from a light so if you want more even light on your subject try moving the light further away.
A light source that is closer seems larger and provides softer light (more wrap around, less shadow) than a light that is further away.
You can make a light seem larger by putting a scrim in front of it or by bouncing it off a reflecting surface.
Usually shutter speed only controls ambient light while ISO and aperture affect both ambient and flash, so you can use this to balance ambient and flash.
High Speed Sync is a feature of some small flash systems. Both Nikon and Canon speedlights offer it. The flash fires several times instead of a single time. This permits the flash to follow the opening between shutter curtains when the curtains are not fully open due to shutter speed being faster that the sync speed.
Since High Speed Sync fires several times, it does not freeze motion as well as a single flash at a slower shutter speed.