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All these tutorials are made in Adobe Photoshop
Photoshop is the best program to edit images
I have also used a Wacom tablet on them
make the skins using the mouse, is very difficult, but not impossible
I hope these tutorials are of some use to you
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I am the creator of the mod "Doom 3 to Doom 2"
If you don't know him, I ask you to keep an eye on him.
here is the address of the official page...
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Photoshop tutorial : skinning (part 01) (basic head) (generic)
Photoshop tutorial : skinning (part 02) (basic head) (guile)
Photoshop tutorial : skinning (part 03) (basic head) (blanka)
Photoshop tutorial : skinning (part 04) (basic head) (michael myers)
Photoshop tutorial : skinning (part 05) (basic head) (riddick)
Photoshop tutorial : skinning (part 06) (basic head) (demon)
Photoshop tutorial : skinning (part 07) (basic head) (manga)
Photoshop tutorial : skinning (part 08) (basic head) (sad)
Photoshop tutorial : skinning (part 09) (basic head) (noeyes)
Photoshop tutorial : skinning (part 10) (basic head) (ratman)
Photoshop tutorial : skinning (part 11) (basic head) (balrog)
Photoshop tutorial : skinning (part 12) (basic head) (ranger)
Photoshop tutorial : skinning (part 13) (basic head) (shemale)
Photoshop tutorial : skinning (part 14) (basic head) (stalong)
Photoshop tutorial : skinning (part 15) (basic head) (grito)
Photoshop tutorial : skinning (part 16) (basic head) (fatty)
Photoshop tutorial : skinning (part 17) (basic head) (old)
Photoshop tutorial : skinning (part 18) (basic head) (fat)
Photoshop tutorial : skinning (part 19) (basic head) (doom)
Photoshop tutorial : skinning (part 20) (basic head) (woman)
Photoshop tutorial : skinning (part 21) (basic head) (zombie)
Photoshop tutorial : skinning (part 22) (basic head) (troll)
Photoshop tutorial : skinning (part 23) (basic head) (frankenstein)
Photoshop tutorial : skinning (part 24) (basic head) (afro)
Photoshop tutorial : skinning (part 25) (basic head) (rocky)
Photoshop tutorial : skinning (part 26) (basic head) (serious)
Photoshop tutorial : skinning (part 27) (basic head) (skull)
Photoshop tutorial : skinning (part 28) (basic head) (badass)
Photoshop tutorial : skinning (part 29) (basic head) (uderzo)
Photoshop tutorial : skinning (part 30) (basic head) (rage)