Now that we have the proper UVs on our objects, let's dive into the fun part, that is, the texturing. It is the more artistic part of the process, so let's start by discovering the Texture Paint tool of Blender.
The Texture Paint tool is a mode that allows you to paint directly on a 3D object in the 3D Viewport while applying color to the texture. This requires having textures with a sufficiently high resolution. One of the interesting points is to paint on a 3D polygonal mesh with a low density.
To observe the paint of our textures in 2D, we need to split the 3D Viewport in two and switch the second type editor to UV/Image Editor.
To activate this, we first select an object, click on the Mode drop-down menu in the Header, and switch to the Texture Paint mode.
If you don't have any UVs, a message will warn you in the left panel (T) of the 3D Viewport. You can generate UVs automatically with the Add Simple UVs option, but it is much better to unwrap...