I've been noticing that people are using a different size of texture for the head


this one:


instead of this



someone care to explain the difference to me?

Probably the lines,when drawed on horizontal direction in that size, can look better.
the normal template make the lines looks more thin and strange.

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This top one (1024x512) just makes things come out just as you draw them, and not come out weird.

For example, on the top one (1024x512), you can draw a circle, and a circle will show, If you draw a circle on the bottom one (512x512) an oval will appear instead of what you want..

In all, the top is better because you could be able to do more and have space to work with e.g. circles and etc.

plus it isn't confusing as much with the many lines to confuse the person whether the face is either too small or big...

Some artist, like myself, use 1024x512 because when a texture is mapped to a toribash body part it stretches it out to this width. Thus, painting in said resolution then scaling to fit 512 makes it so that everything comes out properly mapped.

Short answer: Mapping.