To create the base of the tree trunk in Maya, you will use a single cube, then using the multi-cut tool and holding the Ctrl key on your keyboard, create two loops around the cube, one from each side. Go to the vertex mode to pull the vertices outward to create a circle shape and imitate a tree trunk.
To extrude the branch, select the Edit Mesh tool, then select extrude, Ctrl+E from the drop-down list. To make the branch feel more natural, create loops around the branch to create a circle shape, then select the vertices from different angles to shape the branches to a desired shape.
To create more branches on the tree, simply duplicate the tree by selecting the tree and click the Ctrl D on your keyboard. Then go to your face mode and select the whole tree, holding the Ctrl key on your keyboard, deselect a branch, then align the vertices to have a straight ending. Move the pivot point to the centre of the ending part of the branch by holding the D key on your keyboard.
To place the deselected branch on the tree, hold the V key on your keyboard to snap to the vertices and position it to where it feels more natural. You can rotate your model to have a panoramic view of what you are creating. Then using the multi-cut tool, create holes on the tree and place the branch on the tree, then use the V key to snap the vertices by moving the pivot point to fill the holes. Then, select the tree and the branch, click on Mesh and select combine so that they become one mesh. Then, manually merge the vertices that are on the same place, but are not connected from the Edit Mesh tool bar.
To create the leaf cubes in Maya, you need to click on Create, select polygon and create a simple cube. To soften the cube, like in the concept art, you will click on Mesh Display and select soften harden edges. UV map the cube to connect the parts of the cube.
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