I was responsible for modelling almost all of the foliage in "Lily and the Graveyard Ghosts", a student project I was part of.
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The technique mostly revolved around editing a photo of leaves in Photoshop to fit the style we were going for and importing it into Blender as a texture on simple geometry.
The big orange tree was a hero asset, the other two trees and the foliage were used multiple times across the map.
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Lily (the size reference character) was drawn by Josefina M. (www.instagram.com/josityart).
Additional assets seen in the screenshots by samyyun (samyyun.artstation.com)
Download the game for free at https://aviana-art.itch.io/lily-and-the-graveyard-ghosts