One useful in-camera tool that can help with framing a shot is the Grid Display function. This enables you to superimpose a selection of grids over the image that can help you to line elements up, keep vertical and horizontal lines straight, and work out where to place objects within the frame.
It’s widely available across Canon’s EOS range of cameras, although with some models there are fewer grids and if you’re shooting on a DSLR then it may only be visible when using Live View mode.