Perhaps a lot of people have already seen their official picture website (vk.com/winxclub), but for anyone looking for a direct route to some high quality, large resolution Bloomix and Season 6 School outfit pngs, check out their Deviant Art page. http://winxclubrus.deviantart.com/gallery/
I'm always on the lookout for new or large gallery websites that have many Winx pngs. If anyone knows the relevant ones today please feel free to share too! A lot of the ones I used to frequent in the past seem to have disappeared or changed. Thanks, and happy searching!