Since you wold like some actual feedback, I'll give you some.
( No I will not be harsh because I'm not a douche )
Out of the 5, the second has to be my favorite.
The only thing that bothered me was the little erasing of the top middle frame.
I do love the concepts of each.
The first image with the water, I like how it can actually blend into the image like the water is flowing through the hallway. +1
The second is just my overall favorite. It just stands out to me and I like it. Its like a mind messing kinda thing. It attracts me +1
The third I really like the orb effect. Seems pretty futuristic ( if thats the idea or feel you were going for ) +1
The fourth, I am in love with this water effect. I reflection in the water was done amazingly and I love the clearness. +1
The fifth, I love anything space related but I do think with the other styles you've used you could've made a really interesting spacial theme +1
Overall, I love each unique specification each picture has.
My request for you - Make something using all of the things I've listed above. I would love to see all of the specifications put into one.
Nice work!