I saw someone tagged one of my posts with “wallpaper,” so for the record, I don’t upload anything at a good wallpaper size, (besides maybe some of the vertical stuff which might match up with a phone) but if you want a larger size of any of my art, just ask! I work large, so there are large versions of nearly everything! They might not look good at a larger resolution, since I usually don’t do enough detail work to make it work, and they’re also unlikely to be at the right ratio for a wallpaper, but I have no issues with letting people have the larger size and sort it out themselves.
So if that’s something you want for a specific piece just ask. It’s just a matter of digging up the original PSD.