What’s the theme of your flat lay photo? Pick a lot of props (more than you would conceivably use) so that you can swap things in and out while you’re composing your shot. Gather objects of varying sizes & shapes in order to create visual interest. Have a color palette in mind —the color coordination adds to the overall polish.
Some excellent flat lay photos look more “candid” because they include people. To create a look that has a sense of movement and action, consider enlisting the help of a friend/hand model.
Keep it simple. A plain white background works well because it won’t distract from your props, but you can also pick a neutral like a wood floor or table. To use a colored background, tape some wrapping paper to a floor or table.
Set up next to a window and try to shoot in the morning or late afternoon, when you’ll get the best light. Try not to use a flash, as this is going to create shadows.
When setting up your shot, leave a little bit of space between each object. This will help highlight each prop and keep your shot from looking cluttered. Create balance in your photo by mixing smaller objects with larger objects and placing objects of similar colors on both sides of the image.
Add text or graphics in post-production -- if you’re creating an ad, this is where you can add your brand name and logo. Or if you’re going for a more inspirational look, you can stick in a quote.
Climb up on a ladder or step stool and get shooting. Creating distance between you and the flat lay will help you fit everything into the shot. This is also one of the only ways to ensure that your photo really looks flat.
Once you’re up there, take a few test shots and don’t be afraid to keep moving props around until it looks just right.