Looks pretty good. It is definitely a great first effort. A couple pointers though. If it is supposed to be in Iraq for OIF, post '03, there are a few issues stemming from the Tamiya kit you used. The kit represents a tank as seen in ODS ('90-'91), not a modern one in OIF. Firstly, the uniforms are the older 6-color "Chocolate Chip" DCUs which haven't been worn since about '93. The newer DCUs were 3-color (as below). The box on the right rear of the hull is out of date too. It was an external APU (aux. generator) that was used in the late '80-early '90s. It has been replaced by the APU in the bustle rack. I can't see them in the pics, but I am assuming the tracks are the older chevron block pattern from the kit as well, again, not used any more. The same for the cover over the primary sight. There is a newer one now, along with a bunch of other updates to the Abrams since ODS. The rifle on top of the turret is an older (no longer used) m16A1 as well. Lastly, some of the stowage is the wrong color and again its not your fault, but Tamiya's. Their paint instructions for the gear is off too. Overall a great effort. On the next one, if you want to focus a little more on accuracy, post as you go and ask questions and we'll help you out.
3-color DCU camo

Great job on the Jersey barrier and the rest of the base.