I like to do collages of one piece from several angles, it just keeps the gallery from being cluttered and you can see and compare all the various angles at the same time, instead of having to go back and fourth between the different pages. The only thing is that it should be big enough to see the various views clearly.

I like to use collages for works-in-progress or pics that are just thrown together, for nicer pictures it looks better as single submissions, usually as long as it's only a handful of shots (and not 36 pictures of the same thing... I've seen it done before!)

If collages are well done, I think they actually ADD to the professionalism of an image instead of having ten images in the gallery that all say "just another view".

it's hard to say....If they're done nicely collages can look more interesting than just a single photo, and it's fun to get the overview or whole view of soemthing at once.
Yet I usually tend to like the single pictures better because they are usually bigger and it's easier to see the details, without having a large view that is so big when I click on it that I have to keep scrolling back and forth to take it all in - that always makes me feel a bit muddled.

I always prefer doing collages, just because it makes it a lot easier to track fav's, commentary, and such on a single piece.

I picked collage, just cause I feel it's easier than a lot of
pictures, but it's preference, I don't really mind either way.
Not all people want to sort of collage their works

I wish DA had the option of uploading more than one picture to a submission. Then the extra photos could be thumbnails under the main photo and become enlarged when clicked on.