Note the pretty hanging baskets in this picture. You can also do pots. Or simply plant flowers near the door. Remember to do shade plants if your front door area is covered.
My suggestion with front door flowers is keep it simple. One or two pots can be plenty – and easier to do and maintain. And don’t get caught up in symmetry. One pot on one side of the door looks great!
If I can help with your front door, let me know! email@example.com / 202-905-5369.