Better cropping, imagine drawing 2 evenly spaced lines across and vertically on your pics. That leaves you with a tic tac toe board. At the intersection of the crossed lines is where you should put the point of interest of your picture. The eye is naturally drawn to these 4 points. The face, eye, or main focal point should go on one of the crosses. Try it with some photos you already have and see what a difference it makes.