"For most applications a texture size of around 1 million pixels is more than adequate. 1000 x 1000 if the texture is square will do it. You can always increase the resolution if you don't like the quality."
"Either format works-- PNG has the highest quality-- JPEGS are smaller files with some (often undetectable) loss of quality.
Arroway textures are very high resolution. This is not required for most applications (unless you're doing…"