Can anyone suggest how to paint Osgiliath so that it looks like the ruins on the GW box. I have a lot of grey stone ruins so I want the different look. Any help is appreciated.

I'd use Adeptus Battlegrey (Mechanicus standard grey) as a base coat.
Then some drybrushes, first heavy then lighter with (in order) Codex Grey (Dawnstone) Fortress Grey (Administratum Grey) and a very light dry brush of white.

You could use black washes to dampen the colours if its to bright.

For the greenish colour (mould or whatever) I'd use mixes of green and grey)

Like this?
viewtopic.php?f=50&t=22916#p274013

Here's how:
viewtopic.php?f=50&t=22916#p274026

_________________
C.A.P.T.A.I.N. = Crazy And Proud To Admit It Now
http://chrisgomhobbyblog.blogspot.com/

Isnt there still a painting guide on the GW website. You can find it under Lord of the rings articles. Nice one, look forward to the pics.

_________________
You would of had me crawling on all fours like a BEAST!

Ah, Chris beat me to it.

_________________
Painting: Have not been for ages...
Gondor backlog reduction: 20/64

Here is the link for the GW article for painting the Osgiliath Ruins and also trees .

https://www.games-workshop.com/gws/cont ... d=12800017

_________________
"Ash nazg durbatulûk, ash nazg gimbatul, ash nazg thrakatulûk agh burzum-ishi krimpatul"
"One Ring to rule them all, one Ring to find them all, one Ring to bring them all, and in the darkness bind them"
The Lord of the Rings