Looking good fubar !
the washes really did come out well,
but i would recommend you build up a little more dirt and dust on the model.
sometimes i add a pigment to a small container (a bottle cap works ) and mix in a bit of static grass in with the pigment throw in a few drops of water. Once u get a slurry like mix, take an old brush and stiffle the mix on the running gear, tracks or fenders. It works very well for me when i want to add a bit of caked on mud to my armor.
hope this helps
cheers
shane