Look past your subject. Otherwise excellent images can wind up being average or poor due to distracting background elements. An angler with a fishing rod directly behind them, that appears to stick out of the top of their head, is a classic mistake that I see often. Other examples include onlookers, vehicles and trees. Concentrating on your primary subject is essential, but take time to scan the surroundings for unwanted or poorly positioned items. A minor shift in the position of your camera (or subject if it can be moved) is typically all it takes to significantly improve your photos when you find a problem.