[First] Text does not go with sig, figures in background are faded to much.

[Second] Text does not go with sig, needs border and the flower blue sun thing doesn't fit halo.

[Third] "The Missing Link" text doesn't fit, but the text in the white fits very well, the text to the bottom left should be smaller and I think to change the font of it to a more standard font. Otherwise I quite like this one, maybe a pixel border.

Good job on them overall though.

um sry not much of a rater person but I would say the 3rd is the best.

[Edit] Fourth: Didn't see this one, This one's really nice with great animation ideas and text. I would suggest making the animation longer since it's sorta stuttery, and you really need a border, pixel would do fine. I'd say this is equal to your third.