Preferable one with large pictures and clear instructions.

What kind of costume makeup? Anything in particular you have in mind?

Usually I just extract a face from a skin, use it as the bottom layer as a guide, paint whatever I need on a second layer (if using transparency, make sure you fill in a bit more than the edges so you get clean lines - and make sure to remove the face layer before importing), and use that second layer as the base of the alpha (make it white for opacity, greytones for transparency and black where it isn't supposed to show - in photoshop you can put a white overlay on it so you get the exact edges). Import to game and find the file in SavedSims. It is the same principle of making alpha edited clothes.

Well, I wanted to make some kind of small pattern either to lay near the top of the cheekbone or near the ear but everything I find is either over or too close to the eye. I was also thinking about some type of children's face painting. Small pictures for the cheek probably.

My best tip is to use an extracted face texture as a backgroun when you're working (and if you want to know exactly how it looks, make the alpha white temporarily while you're working on the design so you can see the actual result on the skin). Moving items around from other face paints isn't too hard, as long as you remember to move both the texture and the alpha.

I think I've seen at least one tutorial, but my googling didn't come up with anything, so it's possible I was wrong. I didn't look at Youtube, though.

Like I said above, making makeup isn't much diferent from making anything else that requires editing of th alpha texture, so if you can find tutorials on alpha edits, you can use those as a guide.

I kind of understand what you mean but I don't know how to do any of what you just said. This is why I need a step by step tutorial. For people who already create a wide variety of things what you said is probably good enough but not for noobs like me lol. I've done some recolouring and moved a picture in place on a set of shirts, that is all. Someone asked recently what tutorials I was after and at the time I couldn't think of any and I forgot what thread it was on (or I would ping them) But a good one on costume makeup is needed.

Edit: Would cloning the games costume makeup be a possible way?

What editing program do you plan to use Jo? You probably could use tutorials that talk about editing/creating make-up, because the principles are the same, but maybe you even have enough with a tutorial that talks about using layers, transparency and the like for the program you want to use.

I have Corel Paintshop Pro V6. I was thinking that, maybe look at some regular makeup tutorials first because I have no clue on how to extract a face texture.

You can make a skintone project in Bodyshop and get a face texture from the Project file, or you can open up a skin file in SimPE and export a face texture from there.

These show alpha edting for hairs and clothes, and it's basically the same principle - or at least an explanation on how alphas work:
http://digitalperversion.net/garden...hp?topic=4919.0
http://www.modthesims.info/showthread.php?t=183379

Video tutorials on face details (couldn't find any showing costume makeup in particular)
https://www.youtube.com/watch?v=SdIPJ69W6Oo (lipstick, basics in Bodyshop)
https://www.youtube.com/watch?v=_yYCUfNbvsI (beard with alpha editing)
https://www.youtube.com/watch?v=wCF8hD9jI9I (eyelashes, alpha editing)

You may find some other useful tutorials on recoloring here, but I did't find any spesifically on costume makeup: https://ts2tutorialdatabase.tumblr.com/Recolouring

Another thing you can do is to make a project with one of the costume makeup options ingame, and study how the files look in relation to what actually shows on the sim.

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As long as you have used Bodyshop for projects before, even just for simple edits, you're further ahead than you may think. Have a look at the alpha tutorials, and you'll better understand how they work for makeup.

Some types of makeup have thumbnails too, but this is just the matter of cut/paste a recognizable detail, perhaps resize, and saving the image.

Bodyshop is more or less designed to be used with "any" picture editing program, even something as basic as the simple version of Paint (which used to result in flood-fill clothes with bad designs in the early days, but you can't ask too much from Paint I guess).