I believe beauty is in the eye of the beholder. In my opinion you dont need to be specifically trained to appreciate art, either you like it or you dont, you love it or hate it, as simple as that.
Of course it is a question of refinement as to how much you really want to be able to read into things, anything reallly including art. Coming to understand why you like a piece or what about it draws or repells you can be an interesting journey in itself.
(oh and I'd be delighted to make one for your garden, you just have to ask)
ciao for now,
you can check out my art on Yessy or Ebay happy hunting