Yes it's similar to a displacement map (in fact it's most similar to Map > Warp in gimp). I would try increasing both smoothness and depth to map more to the overall features rather than bumps in the skin.

used displace

With a chessboard i result this:

Image → Duplicate and Desaturate image (DL) → Chess (Render→ Pattern → Chess (100x100)) → DL2 (hair mask layer)

Create the chessb layer(*) and apply it map → displacement → default values DL1 as map
Set Chess layer in softlight mode and duplicate it, and decrease its opaccity about 50 %. Merge down both chess layers and set in softlight mode. (*) I change #000000 (black) into #333232 in the chessboard.
Merge down with DL1. → R1

Add layer mask, oppacity (black) to R1. Copy and paste DL2 on layer mask.

Apply layer mask in R1 layer. Apply a bit of curves (darken). Bump map: 3 depht with Image as map.

Add on top a new layer fill of #828282, set this one in overlay mode. Use white & black colors, low oppacity, to dogde and burn as lights and shadows.

That article explains indeed what is required to make to transform an overlay pattern into something believable. I think jamac4k is almost at the point where it is believable, if we forget about shadows induced by overlapping hairs, it still misses the face perspective, the patterns should recede where the cheeks recede for instance. But hey, that's good so far, this thing is not easy to work with.

As painters say:
Thinking "volume" instead of "pattern" is the key to develop drawing skills.

Attempt with Warp Map:

Chessboard with G'mic ([G'MIC] Chessboard : -gimp_chessboard 100,100,0,0,0,1,0,0,0,255,255,255,255,255,0 #1)

Warp Map: Deep (2.50), Detail (1.76), Smoothness (1.40), Blend mode (Multiply)

Same procedures that in the previous attempt


#K1TesseraEna:
You can try with several texture layers in differents perspectives playing with them.

pfff just about spat my coffee out jamac4k that's far better than I could manage! I'll stick to the coding I think

I thank everyone for their interest in this topic add up and help me with this question!
Jamac4k still can not follow your steps above. But I will try to achieve. ¡Muchas gracias!

A thank you all for the help and hope to learn more and give back the same way whenever you can.

They are both excellent, jamac4k

I've to work more the base layer. I think that warp map offer posibilities to obtain curiuos results.

Very nice jamac4k

#Molly:
I left you a answer for your question about how i textured in Photo manipulation thread.

Thank you jamac4k.

Five months later ...

Got it

This time could follow the tutorial with relative ease!
Thanks you Jamac4k!

Really nice job Akros. coooool

Thank you jamac4k

Hi Molly!
Thx, it seems that now I'm able to understand tutorial Jamac4k. Before I could not get any results.
This was with the "warp map" of Garagecoder.

Thx very much Jamac4k

So you are saying your used jamac4k's tutorial and used the Garagecoders warp map. That was the best result of all of them I think. I might try it tomorrow. I also like the newsprint look. alc did a very nice one too with it looked like cracked skin.

Works pretty nice with just 2 layers.
The desaturated layer and a checkerboard layer.
Select the checkerboard layer and run G'MIC>Testing>GarageCoder>Warp Map



Then i just added a layer mask to the rendered layer and fixed the outer areas, hair line, eyes, and mouth.
Result