When I started learning 3D graphics, I used to give myself 'challenges' with each 3D model. They were pretty impossible challenges (for instance, making a realistic tree without textures and only 100 polygons) but they made designing stuff fun and helped me find creative ways to design things quickly and efficiently.
Also got inspired by other artists online and a few art challenges here and there.
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When I started learning 3D graphics, I used to give myself 'challenges' with each 3D model. They were pretty impossible challenges (for instance, making a realistic tree without textures and only 100 polygons) but they made designing stuff fun and helped me find creative ways to design things quickly and efficiently.
Also got inspired by other artists online and a few art challenges here and there.