AlexTLe - I agree with everyone else, the two on the right are more interesting. Actually I think I would go with the bottom right one, something about that pose appeals to me! (Its like its flying backwards, or have just taken off right?)
Ogi-C - Hey man, its really not a problem

It just makes the challenge that much more appealing! And I would love to have another go at this, but I'm leaving on vacation in a few hours for one and a half week, and I'm not sure how much time I´ll get to draw. If it seems possible I'll definitely try to participate!
htkpeh - I like you silhouettes a lot, especially number 4, its really interesting! If you decide to go with the last one, I'd maybe work on the contrast (I think its the right term). Maybe get the creature to pop out a little more, right now it blends together with the background, making it difficult to read.
chris-cross - That design is just sick! I really like the ribcage-like front on it. The colors and rendering are beautifully done as well.
Machuna - Interesting with the harvesting! I think the wings on the right top one is pretty cool and the body on the lower right has a nice design.. You could easily make a really cool combination I think, or stick with the colored one, both will work great!
eternalfiresong - Thanks man, hopefully I'll get some time on my hands, if not, i'll definitely participate in other challenges
white-raven - Thanks! I'll try to find the time for it, but I'll definitely participate in other challenges later on as well.
Its a cool idea with a nighttime scene! Have you considered you light source? Right now its seems like the moon, which is behind/under your flyfish is the primary light source. That would make the flyfish "backlighted" where as of right know, it seems illuminated on the top. Maybe if you angled the flyfish a bit towards the moon and placed it a few inches below the moon. That would make the moon the only necessary light source.
Sorry if I don't make any sense at all but english isn't my first language.
radeaton - Nice thumps! I really like nr. 3! Number 4 is pretty cool as well, even tho its just for your amusement

I would like to see nr. 1 and 2 with the same contrast as nr. 3 tho!