The shot's especially interesting, because it's got everyone talking. Most people have highlighted aspects of the picture they don't like, which is fair - as mentioned, this is the critique forum and you can take it or leave it - please don't take it to heart as a personal attack eh?
So let's say something nice: I actually like the flash exposure on the subjects. It lends an ethereal quality to them which is further enhanced by the lack of DOF when it was shot. I've just though B&W as well, would that be a "good thing"?
Ok, that's the good news, let's now have some critique which you may agree or otherwise with:
The blurring of the background is quite frankly a bit clumsy - it's apparant from the areas you haven't blurred - the boot lid, bark chippings, black separator and the bit around her hair. I would advise either setting the aperture suitably low, or improving PS or other manipulation technique to make this more subtle. Because you've blurred it, you evidently recognise the need to use focus to highlight your subject - IMO it would be preferable to use the camera's capability to achieve this.
If you are attempting to convey a message or make a statement with this picture then I'm missing it. Were they, as the title implies, up to some kind of sapphic mischief in the boot (trunk)? I suppose this is a possible message - but it doesn't look too much like they were enjoying it, as their facial expressions are kind of... well.. sulky? Perhaps the objective was a kind of moody sultry look, but no, it's definitely coming across as sulking to me.
I really would like to know what you set out to achieve with the picture, who was it destined to be viewed by, what were you attempting to portray and why? If you don't have an answer to those questions, then the snapshot comments hold true perhaps.
For what it's worth, I don't see a snapshot. I see a picture which doesn't communicate an objective or a context. Snapshots to my mind are meant to be viewed by the person who took them, as opposed to finished works which are for the world (or subset thereof) to see.
I want to understand your picture, and I (probably the others too) would appreciate a further insight into what you were thinking.
I shall end with a quote which may well have been from Lord Chesterfield: "Advice is seldom welcome, and those who need it the most, like it the least."
Rob