^^ thanks spanishrose
I’ve thrown away the displacement map and instead generated a normal map for him (as suggested by minoribus). These are the results I’ve obtained:
This looks much better than I’d thought it would be. The normal map is reflecting the deep wrinkles and pores well. The silhouette still remains that of a younger man and doesn’t show the waviness of the skin (more clear under the chin). But for a lowish poly model I think this has come out good.
I used Cycles normal baking. This doesn’t support baking from multires, so I had to transpose the low poly mesh over the high-poly sculpt. I then selected the low-poly mesh, went into sculpt mode and used the inflate brush to ensure the highpoly mesh wasn’t sticking out past the low-poly mesh. I then selected both meshes and then normal baked it. I did try BI normal baking with the ‘Bake from multires’ but it gave me weak looking results. The bumping didn’t really come through and the pores weren’t clear enough. Cycles normal baking gave much crisper results!
At 44808 vertices, I think I’ll call it good on the old man’s body modelling. I may quickly sculpt some veins in his hands if I have time, or I can do it later on. Now, I’ll move onto texturing his body…