Double-check the background
Details in the background can take viewers’ attention from the main subject. They don’t have to be obvious colourful road signs: even the out-of-focus line of the horizon will be a distraction if it runs directly behind a person’s head. For clean shots, look for clear backgrounds that are well separated from the subject. Darker backdrops tend to work better than bright ones, but be mindful of patches of bright sky through trees.