I think it's because you only have one layer of fog in the front. More layers of different sizes and a few behind the hills would probably look more realistic.
Nice job, nice edits. Two suggestions: the background doesnt loop, but it shouldnt be too hard to fix. Also, the music is really good, although the more "Christmas Mario World" part of the song takes about 20 seconds to start. I'd suggest that you edit it so this is the first thing we hear.
so basically you just regrouped every single fad that ever existed on ytmnd, mixed all the audio, and made it sync with the pictures. seriously, this stuff has been done dozens of time (in other uncreative ways).
It's awesome when people have a good idea and they go all out with it, with flawless execution. The first seconds I thought "ok this is gonna suck" but it kept getting better, good work.
Good idea, good efforts, but the final edits are... meh. The animation's slow and the over-used music doesnt fit. Anyway this is so long it seems to belong more on Youtube honestly, so you could get a better quality.
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