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A word of caution: stick to one subject and even though contrast can be good in a collage it can be a big mistake.
You can tell a story story or you take one subject and break it up as I did here. How many panels will be your next question; too many and it will look too confusing. If you choose only two make sure that they are strong images so they project a complete though. Framing and colour has a big impact on a collage and again sometime less is more. Keep both simple, after all a collage is busy to begin with.
AS I SEE IT