Look at your own photographs as often as you can to see the patterns in them and you will also realize the types of subjects that really interest you. Always be looking for ways to improve.
Whenever possible, keep the light source behind you and falling on the FACE of your subject. Use sidelighting to emphasize depth, dimension or texture or backlighting to emphasize shape, form or drama.
Change your angle of view and get closer. Get high or low and fill the frame. Especially when photographing children, great shots can be achieved with tight framing and different angles.