They look great. Don’t worry about the mitres. Even perfect ones would pull open after they’re left outside. It’s a planter, after all.
I made a few this weekend. My goal was to make then last as long as possible. I see you left done space between the bottom slats. That will help immensely.
I made mine as simple as possible with that longevity goal in mind. I rabbeted every single joint so only a few screws were necessary to hold out together. Of course, I went way overboard with the number of screws, but that’s the easy I do everything – overbuild.
I also like the points on the legs. Not only does it look good, but it’s less surface area to retain water and rot. Nice work.
Losing fingers since 1969