Looks great! Are you able to tell that the addition of the blue to the color mix made any difference at all? I noticed in the last photo that there was some additional streaking done....did you accomplish that with AB work, pastels, AK ????
NOICE!!! Good call on the Sky Grey over the Medium Grey. I used the Medium Grey as my basecolor on the Snowspeeder before I applied the paint chips and top color and it's a pretty warm gray, too warm for the Imperial vessels IMO.
I should pick up the older AT-AT, I have the big Revell one but I'm holding out hope on a reworked head before I start it.