I think you're making a lovely start to your gardens, LP! That's a beautiful rose!
We have lots of oaks--and yes, they get quite large...but they grow fairly slowly, too, so it'll be a while before they shade out the maples. If you just planted them, you may still be able to move them because they won't be established yet.
"We are--each of us--dying; it's how we live in the meantime that makes the difference."
"It's not what you gather, but what you scatter that tells what kind of life you have lived!"
"Be kinder than necessary, for everyone you meet is fighting some kind of battle."