What size graphics assets do you need for advertising?

[Misaka]

Looking to make some graphics for my server, and I'm not sure what sizes I need.

Like, 64x64 for server icon, ____ for server banners, ____ for website logo

Any suggestions?

 

[TheCactusBlue]

I usually go 8K on all of them. You can always downscale, but never upscale (w/o losing quality that is)