I'd like to display some quite big pieces of avatar art on my profile, can this be done?

It would be a little tricky to put it on the profile itself, but there are albums you can use to store them. You can set the profile albums on public view so other people could view them. :yes:

I suppose the only way to put it on my actual profile would be to post links, but I like the album idea, I'll look into it. :)

You can try setting them as your profile background image, but it would be a little tricky because of the message boxes. Whichever way you find more convenient for you. :yes:

If you're going to upload them to albums in your profile, you'll want to watch that the image isn't huge. These are the limits that are in place:

Individual picture size: 600 x 600 pixels
Individual picture file size: 780kb - that's monstrously huge so animated stuff will be fine
Numbers of pictures per album: 100
Maximum album file size: No limit, apparently

I've uploaded a couple of pictures into an album and they seemed to go on alright, when I get back on the computer tomorrow, I'll check the sizes aren't too big. It's not possible to do it on my phone which is what I'm on now.