Short, all season tree for small garden

Attached is my small backyard garden. the Japanese maple is not doing well, as you can see. can u suggest a few options for a nice all seasons blue evergreen or some tree that is colorful and there form spring…

Trees for small spaces*

I have built flower boxes, using stone, that follow the steps at grade leading to my backyard at the side of my house.  I have 5 flower boxes in all. The first two are 3.5 x 3.5 feet square. The…