Following that, I overlaid the displacement map on top of the basic colour map, to achieve more details in the wrinkle flow. This gave me a clear understanding of where to draw the larger wrinkles in the next step (Fig06).

I went on and added some dirt to the skin, and gave the skin more colour variation. I used 3DTotal Textures V4:R2 (Humans & Creatures) to enhance the details of the skin further. This helped me to achieve the right age of the model. Because my model is supposed to be an older and poor man, I added some more facial dirt, and implied an element of skin disease present (Fig07).

Next, with the help of the overlaid displacement map, I painted in the big wrinkles (Fig08 - 09).

This allowed more detail for the skin and the model (Fig10).

I then added the tone of colour for the beard and other areas of his head, and gave more detail to the nose (Fig11).

I continued by adding all of the tiny details that were needed to achieve an elderly male look in the skin (Fig12). With all of the textures painted, Fig13 shows how the model looked when rendered. 

Fig.12