Take lots of photos. Every project I shoot, I carry an extra camera around with me all day and I take tons of photos as tests. I shoot them at a high ISO on a low-resolution setting, and I never use them for anything beyond checking what looks good and how the light is playing through a space. And when we set up for a photo, if I don't feel like it is as good as it could be, I try the shot from a different angle. Sometimes I'll do it again and again until I get it right. It takes a lot of shots to get one good one. Keep shooting and never settle for just okay.