3. Shoot high and low
When shooting from down low on the ground and pointing back up to your subjects, you'll need very high ceilings and tall stands for your backdrop to go high enough when shooting indoors. Alternatively, use a flashgun and shoot outside, using the sky as a colourful background to your portraits instead.
Another top tip is to keep your studio space clean. If you're shooting full-length portraits with people's feet in your shots, then be careful to keep your floor and backdrops spotless – otherwise you'll have to spend time cleaning up and cloning out footprints and dusty marks in Photoshop afterwards!