GREAT JOB!!! DRAGON's M1A1 AIM, M1A2 SEP, and M1A2 SEP V2 KITS ARE ABSOLUTELY THE BEST ABRAMS KITS TO WORK WITH!!!
I really like your "minimalist" weathering- That's how I build MY stuff. The only difference between my various M1 Abrams builds and yours is that I piled on a little bit more stowage, and I added crew members (See Jeff's pic of the real M1) to several of my M1s, one of which is tied down on my HOBBY BOSS M1070/M1000 Tank Transporter- ANOTHER EXCELLENT KIT!
Again, GREAT JOB!!! KEEP UP YOUR FINE WORK!!!