First Impressions: [8/10]
at first glance what i thought (sometimes unedited thoughts
and how my mind works when i first look)
its a nice poster. the first thing i noticed is the colors its a nice soft peachy pink.
and i think it works well with your theme, which ill talk more about later.
next thing i noticed was that the blending could be improved.
i also thought it was weird how the characters are monochromatic.
(essentially only shades of one color)
 

Technique: [12/20]
how masterful are you at blending/cutting
i think your blending could use some improvements which will help your poster a lot.
the following link is just one method of blending. check out this to get more info. 
although you dont need to do it that way, there are some other tips in there that might be useful.
there are some parts of the guy that is not blended very well.
for instance, his hair / head on top is sorta gone / missing and looks awkward.
also where the grass and his body meet is very harsh and could use improvement.
the white space between his arms stands out a lot as well.
the girl's head is also not blended in well. I think it was because it was
a hard picture to use since it seems to be a mainly dark background and youre trying to place
her on a light background so it stands out a lot.
you could have tried to make that particular corner darker if you wanted to use that image of her.

Resources: [17/20]
does your images/stocks/brushes/textures enhance the poster
the images themselves are good and suitable. The girls seems a bit more blurry though,
so a light sharpen would enhance it more. the textures are good and match. 
the stocks are not bad but i would like to see you use something that will add to the meaning of the poster more.
maybe like photographs, or a clock, or a locket, of a whatever may hold meaning to the story.
the vertical lines on the top of the poster is also distracting.
i think that keeping textures/brushes off the characters face is a good idea
since it will help the viewer focus on the poster.
i like the grunge and scratchy textures used in the poster.
they are subtle but they enhance the piece.

Composition: [17/20]