Don't simply reach for the first piece of paper or canvas you find and it your still life onto it. Part of setting up a still life and finalizing the composition is deciding which shape or format of paper or canvas would work best for that particular setup (flower).
The usual options are for a square, portrait, or landscape format. The photo shows the same flower in a square (top left), portrait (top right), and landscape format (bottom). Once again, it's not that any choice is right and another wrong, it's a question of your choosing which one you think would suit the subject best. (Oval and round are also options, but these aren't often used; framing is trickier for starters.)
