After looking around, I came across this tutorial on creating skin texture in Photoshop, using the Shadows and Highlights; as well as the use of Multiply layers. I decided to apply this concept to my UV map, and here is the outcome.
This exercise did not work particularly well on a 3D figure, because it looks odd and unrealistic. This is largely because shading in Maya is usually created from external directional lighting as opposed to texturing. I decided to experiment further, and using a softer brush, I applied blushes to my UV map and the outcome looks better.
From this, I have learnt to be more subtle when applying marks, such as hair or blemishes to a model and to use softer brushes. I have also learnt to make better use of Layer Modes (Multiply, Dissolve, Overlay, etc.) to make textures blend more naturally. When creating a texture for my UV map as part of the tutorial, I shall aim to produce something like the image pictured above.