Lets think out of the box for a bit.

First, there are all variety of "Rules of Thumb", many that contradict others. They are all guildlines, and may or may not be helpful.

What you have to do, with each and every image, is decide exactly what is the "subject", and whatever is not precisely that then becomes just another "visual symbol". Every symbol relates to the subject, more or less. If any give symbol is a distraction it needs to be adjusted in some way that lessens the distraction. If it can't actually help the viewer understand the subject, it needs to be removed. If something that would help more doesn't have enough prominence, it needs to be brought out more.

That is in great part what we do when originally composing an image in the camera's viewfinder. We move this way or that way to position everything "just right". In post processing we can clone things out of the image, and we can make things lighter or darker, sharper or not. And just as when originally setting up we can crop the image too.

You've got a couple tough images to work on for some very nice reasons. It's your kid! She doesn't look like a handful of "visual symbols" to you... You didn't mind cropping down to just her, but past that it's a sacrilege, almost. Get over it... be ruthless, it's a photograph and isn't reality.

Think about this. On the top image try cropping along a horizontal line that is just below her teeth, cutting off the bottom lip. On the second image it's almost the same, but crop just above her upper lip, or perhaps just a hair below the lip and allowing virtually no teeth to show. Hmmmm...

What is the subject? It isn't her, it's the life and the light of her eyes. Her smile is wonderful it's true, but it just detracts from those eyes!

Shooting at f/2.2 you have a very limited depth of field, and it appears that only a couple of petals on the flower near the back at the 2:00 position are actually in focus. The rest of the image is either soft or largely out of focus. Perhaps since you are shooting against an uncluttered background you should try this one again with a smaller aperture.

Composition wise - for me the frame is to lopsided, all the weight is in the lower left corner. Tilting the frame dose not help. Cropping off the bottom tiny bit of petals doesn't work well. If you are going to crop then make it look like you meant to do it, not like it's an accident.

Hope this helps...

Bill