Hello there ! I am building a diorama where there is a roof with slate roof tiles. I hope someone can give me tips on how to weather the roff tiles.
You can see the roof and a test piece maybe the right side can be good enough.
would be grateful if anyone can give me a tip on what I can do / Micke
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What you have done looks good to me.
Second what @HeavyArty said. Looks convincing.
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I can only agree with Gino on this.
Moss could grow along the lower edges of some of the slates
http://handbok.alternativ.nu/Bygga_och_bo/Tak/Skiffertak
Varying degrees of growth:
Download pdf from this site: Skiffertak
contains some useful images showing moss et.c.
Link to large image showing different growth/moss
Another pdf with useful information:
Skiffer på tak - Hantverksintervjuer och aspekter på varsamhet | Hantverkslaboratoriet, Göteborgs universitet
Before and after cleaning of a slate roof:
Thanks for the link. I will try with the right one and do sam rain streking effects / Micke
I can only provide some inspiration,
you provide the artist work 
How are your slate tiles made? Did you cut individual tiles? Are they in strips? Etc?..
The slates are superb looking already!
As others have said I would maybe add some light moss on lower edges.
J
I agree. The fissile (small planar fractures) texture of slate is really well captured here. And the painting makes it stand out!
Thanks I have tried a bit now with light moss and streaking. The roof tiles is made off plaster casting in a mold from Dio Debris in UK / Micke
I agree it already looks great! If you want a really weathered look you can try some high grade artists water color paints. They act just like enamels, so you can streak them, use it as kind of a wash, speckle it on and blend them. The greatest thing is you can react them with water days after applying them, I just tried them on my 52" long USS Cobia and it works great! They also dry to a great ultra flat finish.
Thanks for the tip I will get such colors and try / Micke
Hey Ezra! What brands and variety do you use / thanks Mike
Very nice work Micke! I think that with an extra touch of the great tips you got here the final result will be top notch! /Erik
PS nice to see all the Swedish flags in the comment field:)
Your first attempts are great . Slate comes in different colors and hues and different mosses and grim can be found on old slate roofs .
Can’t beat those Dioramadebris molds the flakey edges and raised relief lines are a great feature making them very real looking .
Your roof looks amasing as it is. I wuld only try to do some shadow in the crevicies where one meet another and in those long horisontal lines betwen one row and another.
Hope you understand me… 
Something like this
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I use the Koi water colors pocket field sketch box. I’ve had it for years and have barely used half of it, a very good deal for the money.
https://www.google.com/aclk?sa=L&ai=DChcSEwiU27eBq4ruAhWv8sAKHaSUA9QYABAGGgJpbQ&sig=AOD64_1Ms_PeWapK3xwYlyUMNzhelKjV5w&ctype=5&q=&ved=2ahUKEwinkqyBq4ruAhWWIDQIHVhHBAIQ9aACegQIBBBF&adurl=
Thanks for the photo now I understand what to look for / Micke
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Hope they help you!
The colour, texture and amount of vegetation is dependent on the quality of the air. If the house is in a city or industrialised town, you’ll be looking at greys and greens for algae. In the rural areas, mosses, lichens etc. where the air quality is better.