|Hi Louie, we meet again!
There are a few things about this shot which don't really appeal to me but I think that the voters will have also hammered this because of the lack of tie in to the challenge - the rain isn't really a feature of this shot and (if your model would have been prepared to get a bit damp!) it could have been.
Technical: It's nice and sharp, but unfortunately so is the background - I would have been tempted to drop the aperture to no more than f2.8 to try and blur things a little. The lighting is also really harsh and keeps dragging my eye to the white area, which shouldn't really be the focus.
PP: I'm not sure what, if anything, you did but my only real comment here would be that her skin looks almost unnaturally smooth, which detracts from the natural feel I think you should be shooting for with this title.
Artistic: Again, completely subjective. The background is a killer here - it's harsh, boring and the perspective is unbalanced - by which I mean that the street level yellow lines are up round her waist. It just doesn't work for me. The other issue is her expression - she looks so angry! April/ spring / showers really calls for a natural, happy look I would have thought.
If doing this again, I would look to change the perspective (maybe shoot up, to catch the look of the falling rain? and get your model to relax, jump, dance, something less moody.