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As you advance in your Canon Rebel T3i photography, you’ll want to learn more sophisticated lighting techniques, using more than just straight-on flash, or using just a single flash unit. Check out David Busch’s Quick Snap Guide to Lighting if you want to delve further. I’m going to provide a quick introduction to some of the techniques you should be considering.
Direct light can be harsh and glaring, especially if you’re using the flash built into your camera, or an auxiliary flash mounted in the hot shoe and pointed directly at your subject. The first thing you should do is stop using direct light (unless you’re looking for a stark, contrasty appearance as a creative effect). There are a number of simple things you can do with both continuous and flash illumination.