Tried my hand at this with whatever was available at hand. From the photos I notice I need to work on removing some of the grey spots on the walls and stairs. I used a fine 320 sand paper to dull off the plastic, then a combination of light (acrylic)fabric paint and coloured chalk. I also feel I may have over done it. Would appreciate any advice on improvements.

Thanks Sebastian... I really do appreciate the comments. Guess it mus be quite obvious.. tried to finish in one go. Problem was I started the process while the pieces were still on the spruce and was impatient to see the finish product. And you are right about the dark grey spots, actually thats what happened, and I had run out of brown to correct it. In fact the MOI is out marketing and just called her up to get some more brown.

Yes I agree, most wood ages and weathers to a grey colour, which is very very hard to replicate on plastic of any colour. Try a thin wash of matt grey, but very thin, and repeat if necessary afetr drying. Or first try a grey chalk.
Otherwises I like the result you achieved, it is very good.

regards
Kimball

The brick looks really good as is. However the larger stones on the corners, top and bottom of the 1st floor and around the lower windows I would paint a (light?)stone or concrete colour(I'd go for polly scale aged concrete.)

The cimmney area needs to be less black. try to get the same amount of soot on the chimmney as where it meets the roof. while your'e on the roof, paint some induvidual and groups of tiles a slightly lighter or darker colour and apply a "wash" of ultra-thinned black paint on the roof to highlight the recesses. dont get it even. variation in darkness is good

I'm going to go on a tangent and contradict some people , but my observation is that the wood bits will be treated. most likely with creosote(a coal distillate =>black) which will weather to a brown-black colour over time. I wouldn't put the dabs of grey on the wood, but maybe mix up the brown-black colour by eye and don't mix it completely, so you get subtle variations
I doubt that the stairs would be unpainted wood but who knows. it's your model, sso you decide. If you do decide to go for bare wood, paint it light grey with a bit of brown as I don't think they creosote the small timbers
it might be a good idea to look for real life pictures of what your'e trying to achieve. Tamya weathering powders might be a good investment too
Have fun,
Kariosls

You took the first step (even if it is a bit wobbly) on a journey - go for it, enjoy and hone your skills!

Please go to this website :http://www.railroad-line.com/ it is packed with info and ideas