Good job on your pics. I have no formal training so anything I suggest is based on instinct and trial and error. When your taking the pic, be more aware of your backgrounds and what they are doing to your composition, if you can't correct the composition while taking the pic then correct it afterwards w/ cropping.
This first one in this group the background is very distracting, not much could be done w/ cropping, and maybe not much at the time of the photograph in times when you just have to snap or lose the shot (moving uncooperative subject)
Second one better background, but when faces are shot rarely is it effective for the eyes to be shut.
Third one pretty expected almost center crop, I would play w/ different crops, slightly angled or bottom or top of the field, something just to make it a little more unexpected.
Forth, cool candid, action type shot, good perspective, background is a bit distracting, but not as bad as the first one.
Fifth one the white blob in the upper right very distracting totally taking away from the shot. This one would be great for a 1:1 (square) pic. I see two good choices crop the a square w/ the center of the rose the center of the square, you will crop out the white blob, leaves and outer petals, and really focus on the best part of the pic. The other would still be cropping to a square, but keeping that left most green and cropping down from the upper left corner to make the pic a square, losing the white blob, and unattractive rt leaf, you will still have the center of the rose (prettiest part) but instead of a direct center shot it will be off center and you still keep some of the contrasting green in the shot.
Last one, that distracting yellow thing over the birds head, I would either crop it out or erase it w/ post processing tools.
Those are just my thoughts and opinions for what they are worth. (and only give since you asked)
I know I tend to be bad with centering stuff and need to get out of that habit.....
