Your guild must reach Level 4 to upload a Guild Mark.
I spent an hour on an upd draft, trimming a dragon down to 4 shades of red, tweaking every pixel until the border stopped bleeding. When I finally uploaded it? My guildies saw a crisp, bold mark on their minimaps and buff bars. No distortion. No blur. Just old-school charm.
With only 256 pixels to work with, every pixel counts. Follow these tips for a professional look: