I hate to be the only detractor. All my criticism is honestly intended to be constructive.
Your tag says "Blender", which I use. Four simple things that would help immensely: (1) add a second texture to the poles and transformers to make them look "dirty", like a Clouds texture using the Colorbar to adjust how big the dirty patches are; (2) do a "Fractal Subdivide" on each telephone pole (no more than 5%-10%) to make them look less like perfect cylinders; (3) since you have a sunset in the background, your lighting should be only from the sun and orange-tinted, with less ambient white lighting; (4) and finally (and I say this to almost every 3D post on NG), please BEVEL. No object in real life has infinitely-sharp edges, so make all your hard edges softer (for example, the transformers and cross-bars on the poles).
Really, though, the biggest flaw in the image is the birds. (Sorry.) First, the bird model is underdeveloped. The wings are clearly single flat polygons; they should have some depth, made in 3D instead of 2D, and maybe give them layers (either in the model or in the texture) to represent the different layers of feathers in a real bird's wing. Also, just about everything about the bird needs more polygons, as it looks like a 3D model at the moment. You might want to play with "Add Modifier" -> "Subsurf" to make a more detailed, less angular bird model.
The second problem with the birds is actually the hardest problem to tackle: they all look exactly the same. It's an excellent use of "DupliVerts", I must say, but there needs to be *some* kind of variation between the birds. I know this is bloody hard to accomplish with "DupliVerts" in Blender with just one model. BUT, you can make 3 or 4 resting-bird models, and try to mix and match them so the birds don't look quite so uniform. Or, after using "DupliVerts", use Ctrl-Shift-A to "Make Dupli Objects Real", after which you can modify each bird individually. An easy thing to do is to mess with scales in X, Y, and Z independently and do some slight (1-5 degree) rotations on each bird in all directions. These tricks will help mask the fact that all the birds are from an identical model.
THAT SAID: Your use of textures is excellent, and the geometry of the landscape is perfect. The overall vision for the image is high quality; in fact, if you don't Full View it, the picture looks wonderful as it stands. Most of the critiques above were because I stared at the thing in Full View for a while. You, like many 3D artists on NG, don't have the technical knowledge that I have, but are a FAR better artist than me because you have the *vision* and imagination to generate a captivating image.
Don't let the details get you down, and I hope I've offered helpful advice.