Thanks for all the comments guys.
@ Varakir, I forgot to high light the feet only noticed when you said and i'll try the idea with the lens flair.
@ Midge913, I did do some highlight but they didn't show up to well so I've added some more
With the weathering I didn't know where to start, so I've just gone with a bit of soot on the exhausts and a simple wash as a few of you said.
I used 1 part charadon granite, 1 part graveyard earth and 8 parts water, which made a nice muddy wash for the tracks and lower 1/4.
I did have some decals on there but when i put on the varnish it made them look like they had white or something under them.
but thanks to TheReverend I've got some fists from the drop pod kit.
I've added a little triangle to the bottom of these to help them blend in with the metal GW parts
As always C&C will be much appreciated.