I got the grass from Megascans. https://quixel.com/megascans/home?category=3D%20plant&category=grass&search=grass&assetId=qmBr2
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As for making nice grass I mean the 3d model usual does all the work for you. Adding in different sizes and rotation angles is good too becuase when you look at grass each strand is different. Foliage is kind of a pain in the ass for making it look somewhat real. I rarely do outisde scenes with lots of grass since I did this scene haha.
If you have an epic games account you can access the whole library for free by installing Quixel Megascans Bridge. Since it's a personal project you don't have to worry about licensing issues. https://quixel.com/bridge
It's a good start keep it up!
Now time for some life devastating critique :) : First things first, the lighting. The scene seems like it's foggy but the shadows are really sharp. Increasing the sun size( idk how it's called in rhino) should give you softer shadows. Also look into HDRI's, there's an amazing website called: https://hdrihaven.com/ If you scroll in the cloudy category you will find something that fits just perfectly!
Modeling wise I would chamfer all the corners of the building, since it's made out of concrete I would do it just enough so that we can see the light bending around the corners.
Also, when you have some time look into quixel megascans. You can get it for free by having an epic games account. Here's a link to the Icelandic collection, which I think would fit the style and location you're going for, there's materials, models and a bunch of other stuff: https://quixel.com/megascans/collections?category=environment&category=natural&category=iceland
Good luck and keep getting us updated on your progress!
Davinci Resolve.
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However, if you are already familiar with photoshop it is probably worth the ~$20 a month to subscribe to after effects