When it comes to composing interior photos, I have found that, when it doubt, it is always best to shoot straight on. Using your room’s architectural framework as a guide, point your camera so that it aligns perfectly with one of your walls. If your camera has a grid or compositional guides in the viewfinder (even iPhones have this feature built in), this is a perfect moment to use that tool. You want to make it so that the wall’s horizontal and vertical lines (along with the horizontal and vertical elements of items along that wall) are aligned, almost as if on a grid, within your viewfinder.
One of the biggest obstacles you might encounter when photographing an interior space is lack of space. When shooting indoors, especially within tiny apartments or smaller rooms like kitchens and bathrooms, you might find yourself backed into a wall (literally) when attempting to get the perfect shot. Oftentimes, people’s first instinct is to go out an buy a wide-angle lens to fix this issue, but this option often results in distorted, “fisheyed” images. I’ve found that the best way to get the shot you want is to not change your lens, but change your environment.
If you’re shooting close-ups or vignettes within your space, it is important to know how (and when) to use your aperture. Essentially the tool that controls the size of the hole light is allowed to come through, aperture is also responsible for controlling your camera’s depth of field. If you’re shooting a close-up of a vase, for example, and you want your background to be blurred out, the focus tool is just one half of what you will need to achieve that effect. The smaller your aperture number (or the wider the aperture hole), the shallower your depth of field. The larger your aperture number (or the tighter the aperture hole), the more in focus and sharp everything will be. To get a blurred background on your vase photo, then, you will want to shoot with a wider aperture, or the smallest f-stop your camera will allow. Conversely, if you’re shooting a wider space or an entire room, you want to make sure that your f-stop is cranked all the way up so that everything is in sharp focus.
Interior photo shoots...aperature has a play in this, as it should all the time. But when you are taking a photograph of your den, you want to shoot head on. Not sideways or at an odd angle. Line up your camera as a direct eye to what you see...give the feeling of everything is a blank canvas and this is what I've made from that idea. Plus the stick figure example are worth the read.