Well to begin with this image surely hits you quite hard visually at first glance, mainly because of its bold-provocative theme. The framing and the use of brushes to add the artistic elements to it is very well done. This holds true for the backdrop of the main theme, viz. the city and birds flying around. In terms of originality the addition of the odd creature at the back is deemed novel, yet its meaning or symbolism remains elusive (at least to me), while the posture and expression of the allegory of Passion is quite common, especially in Renaissance art. Moving to technique it appears that there exists a striking qualitative and stylistic difference between the back and frame, and the main theme. The back elements belong to a vector designer style, while the main theme to a photorealist, an odd combination that does not seem to blend very well. Furthermore the realistic main theme needs more attention to detail, as the cropped stock images do not blend very well with the background (especially the girl's hair). All in all it is a quite well constructed and strongly symbolic photomanipulation, well-worth being part of DA's fine arts collection.
I wish I could write critiques, but I don't because i don't know all the technical jargon, I just know what I like. I assume you use stock images because you credit the people who make them. It would be kool if sometimes you could give a link to the actual piece you used, for comparison. It is a dark and disturbing image, but I really like it. Thanks for sharing your talent Po!