For a Gaian, I'm going to agree with l'il-Taylor-lover here. The Gaians are a colorful little band, despite being tree-hugging hippies in most people's minds. The man neither looks like a tree-hugging hippie nor seems like the kind of guy who cares about the environment in any capacity, between the facial expression (keeping in mind that the expression on a face in a sig usually is a statement of character) and the quote.
It'd be a beautiful IND sig, as I said before- but for Gaians not so much.
For the Corvo sig, now that I know what it is, I can go into more detail...
Exploration, particularly with the quote "to explore and wonder" in it, I would expect a gorgeous display of the majesty of some bright frontier. Awe-striking beauty, rather than hard and "down to earth" (or space, rather:P) muted tones.
The sig itself is beautiful, as always, though I don't feel it matches its intended message. It seems more suited to a dark and somewhat tragic corporate "villain" or some sort of puppetmaster (good or evil) than an explorer.
Compare Battlestar Galactica (the new one) to Star Trek (whichever, they all share this). BSG is about the gritty, tragic lives and stories of humanity desperately trying not to be exterminated. Ships are dark and grimy, the music makes extensive use of cellos, snare drums, and bass drums. Star Trek, on the other hand, is about man claiming its place in the universe, exploring the wonders found even within our own galaxy. Ships are coated with a bloom-like effect, most Federation ships are off-white or light gray, and the music is filled with brass, flutes, and symbols.
Both BSG (particularly "Daybreak") and the new Star Trek are very pretty and modern-looking. However, the message is different, and the selection of tones and music changes to match.
Both of the sigs you have here are very professional and well-made. However, they don't match their message. Do you see what I mean?
Also, if someone could comment on the assorted stuff I've spammed the last page with, specifically on how to make it look more "professional", that'd be great.