Are still trying out the other photography tips?? That's the key - just keep trying and practicing. I'm going to step back from some of the technical stuff and do a post about general tips. I thought everyone knew about this, but now I'm realizing that this is new to a lot of people.
Rule of 3rds - have you heard of it? Some viewfinders actually have this drawn on the screen or have the option to turn that feature on - it's where you divide the screen in 3rds, up and down.
See how her eyes are at the "sweet spot" and her body is following one line and her legs are following another line. Now just remember after all this talk about a rule - sometimes rules are meant to be broken.
(do you know how to do this? whatever's closer to the camera will seem bigger, so put the one doing the stepping close to the camera and the one being squished farther away. The tricky part is trying to get kids to hold still while they have one foot raised high!)