I am quite new to Blender and have been following this tutorial How to Create a Low Poly Tree in 1 Minute. Everything went perfect except my tree trunk (circled in red) has even light from every angle, instead of casting a shadow away from the light source. The leaves/branches, on the other hand, appear as expected with the light source (the tutorial uses "cycles" for rendering).
Here are the nodes (if it helps). The tutorial uses "smart UV".
Tutorial for adding UV light to the tree trunk - 0:54