Custom images for homebrew items

I recently commissioned a sweet illustration for one of my homebrew items (https://www.dndbeyond.com/magic-items/2730086-eversmoking-bong), and I'd like to add it as the item image on the homebrew page, to replace the default image, which is currently some sort of lobster submarine.

Is there a way to upload custom images for the homebrew things you create?

yes you must download to image to the portrait slot doing this will replace the default portrait and add the image into the description 

Found it! In the Edit page, it's under the "Additional Information" heading, items Avatar and Large Avatar.

what about for creatures? i can't find the "additional info" page

Quote from BranniganBattlehammer >>

what about for creatures? i can't find the "additional info" page

For homebrew monsters, there is no "Additional Info" section. The same "Small Avatar" and "Large Avatar" fields are just down at the bottom of the page.