Ooh! They’re all so good! I’ll criqique each one:
1: That bloom coming from over the structure looks really cool, but maybe try some other colors/shades of green for the grass
2: Having it in black and white is definitely interesting, but I feel that you couldn’t fit in as much overall detail with just that.
3: This one is my favorite (other than 10). It looks so lively, like a semi-underground city, I’d love to see some more detail put into it.
4: The “grand-scale” look of this really shows. I especially like the use of atmospheric perspective on the further away things. I think just adding a bit more stuff in the foreground could improve this one.
5: This one seems like a recoloring of 4. Same comments for that, but I do like this coloring more than on 4.
6: As I’ve said before, adding some more detail could really show how cool this one could look. If the clouds were softer and partially transparent I think that could look cool as well.
7: I’m gonna admit, the center structure looks like the flying spaghetti monster. I think the mountain below it looks really cool as well, and the big shadow coming across the characters.
8: The characters facing the “camera” is an interesting change. Also that beam coming down from the back structure. The colors on the background areea really cool, particularily the cyans & blues, but I think that the other greens don’t look good at all.
9: This one sort of looks like you just photoshopped in a strange image behind the characters, I don’t think it looks that good…
10: My other favorite. The characters coming out of the portal are simply amazing, and their god rays coming out from it are spectacular. I also love the contrast between the blue/black of the characters, and the darker purples in the background. I can see there’s already a lot of detail in this one, but it would be even better to see this one more fleshed out.
11: This one doesn’t really seem like the “Hero” theme you’ve been going for to me, but I do think that the characters coming out the portal look pretty nice.
12: I’m not going to lie, these colors are a bit sickening. The contrasting use of turquoise and dark amber just doesn’t work. Though again, the characters coming out the portal look very nice.
13: The colors on this one are very strange to me as well, they’re just too vibrant in some places. I do think the ground and cliffs look right, but the sky doesn’t fit very well.
14: Just like the previous 2, the colors are off again, but the characters look cool. I like those circly arches to the left, too, sort of like that one scene in Avatar (If you know the one I mean).
Overall, nice job, but a lot of the coloring could use some work. 3 & 10 are the best to me, and I’d like to see a lot of thse a bit more fleshed out. Hope you find this useful 