These were difficult enought to shoot without
getting the leaning tower of Pizza effect.
#’s 1&2 are good, just a little tweaking in PS would improve them.
A slight rotation for #1 to straighten it up and for both slightly darken
them and then using the shadow/highlights tool to release some detail
in the shadows, something like that.
#1 and 2 are too similar, and both are hampered by the branch covering our view of them. It’s a good idea to frame a subject by using trees, but keep the view of your subject clear. #3 is better as it is quite balanced. #4 is a weak shot – an unusual angle, framing using the arch or a specific focal point would have made it better.