Always use the highest resolution setting on your camera to achieve the best image to transpose your photos on canvas. It will use more memory but provide a much higher quality image for us to work with.
If you're taking pictures of children, babies, animals, or something else smaller than you, get down to the same level to get a better picture.
Don't be afraid to have the main focus of your image to the side, it doesn't have to be central if the backdrop is worth capturing too.
Make sure you have enough light. A dark picture will miss the finer details of your subject. Play with shadows and light sources to create different effects. Landscape images can look especially beautiful at dawn and dusk and create a wonderful 3 or 4 panel photo canvas.
Read the manual. If you know all the features and functions of your camera you will have more tools at hand to create the perfect image.
Be prepared, you never know when that perfect shot will appear, and you'll be disappointed if you miss it!
Take lots of photos, you can always go back and delete the less perfect ones to regain your card memory.
Take pictures from unusual angles to make them more interesting, you can make the most unremarkable things remarkable!