Axle: that looks like it fits great, but it seems like the top of the head got cut off just a little bit
Possum Roadkill: that hummingbird looked amazing, I'm personally impressed, only thing I don't really "understand" in the pic is the four little crown shaped water splashed going down with the water..
RHoward: those recoloring are amazing, the only thing that isn't convincing is the eyes on the second one, but besides that it could easily pass for a legit photo that got smudged up a bit.
here's my attempt, I posted them in the abstract, but someone recommended to post them here
They are the portals from the video game "portal". I whipped them up in about 10-20 minutes. As far as a the sloppy renders, you can see the white outline a bit on the portals, but when I redo them I know an easy way to fix it. Next time I do it I'll increase the canvas size and do a more elaborate one with a more abstract environment, this was a rough draft...
as far as making them you just get a thick orange/blue circle. throw in a gradient with color burn i believe, above the portal layer, and then it will ideally be a little darker on top. make about 3 duplicates of the original portal. have one select the portal and the inside of it, do some low scale dents. for the next layer, scale up the dents a bit and twist them a bit for a wispy look. the third duplicate is for any other effect you want. merge them down. you should have a transparent orange/blue portal and have no problem with putting what you want in the background, and then what you want in the portal...
orange portal (original)
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blue portal (just used the color flip/rotate plugin)
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any criticism besides the sloppy render that I did lol, this was all done in paint.net except the brick wall and the great wall of china obviously