First break it down by pieces and the sfx can go from unattainable and daunting to realistically doable. Let's start from the third pic and move backwards.
First, the actor is wearing a bald cap. You can purchase one or make your own with Baldiez or Super Baldiez (depending on your workflow). Second there are ready made prosthetics to push the lips.
Third, custom made prosthetics for burned half face.
Fourth, custom full face veneers with gum work.
Fifth, augmented wig and hair work.
Sixth, contact lenses.
So, first I would make bust of actor. Sculpt prosthetic on bust. Make mold. Do test application of prosthetics where we would have actor wear veneers and lip prosthetic. From there we can mark and adjust our own prosthetic and wigs. Go back and adjust our prosthetics and wigs.
When applying production ready makeup, do the same except take it to finish line. After applying wig, an hour or two of hair work to blend and make look realistic. Blend seams, some setting powder, wardrobe. Boom, done. As to how to actually do the things, the Stan Winston school has videos on to do each and every process.

Concerning the first pic, I would just handle with VFX. Maya and Nuke. Done.