Male Head Sculpts

I became inspired to have a go at a realistic sculpt as practice. I used my dad as reference in parts. I'm trying to figure out the most realistic way to make skin however my PC specs are low so doing anything with a lot of polys creates a big problem and a lot of crashes. Therefore I had to do the pore like details in Substance painter rather then in Zbush itself. I spent a lot of time trying to get the skin looking realistic in substance painter. I'm happy with the results but there are areas I should have created deeper folds and areas that look too deep.

The other sculpt is in Zbrush and the textures on him are polypainted on.