Head band hair tuck for long hair: make a bun but leave some hair underneath, then cover the bun by bringing the loose hair over it and tucking it into the headband. Quicker than tucking ALL of your hair!
If you're wearing something with a pattern, try echoing one of those clothes in another garment. Here, the green shirt echoes the green diamonds in the shorts. A neutral necklace keeps the outfit looking natural instead of too bright.