|Hi, Critique Club here...
I'm in the same boat as you, no gardens in the Winter.
I think this scored low because a lot of people didn't really relate it to garden. Also, I think it's a bit too linear, nothing for the eyes to really explore that would make people stop and look around for awhile. One of the commenters referenced the diagonal and I agree with them that it kind of breaks up the patterns of glass.
One last thing, you might want to crop all but the last edge of snow from the top. First because it's blown out, and second because it will move the glass panels off center which might help the interest level.
Just one person's opinion, hopefully it will give you something to consider.