First image: Wow, that guy kind of looks like Sasuke.
I noticed how well you can do the poses and character structures, Galatea. That I salute to you, it's a pretty difficult thing to master. Obviously your style aims for a more chibi or cartoon thing, so seeing a cute face like that on a near-anime perfect/conventional body is a bit strange. But I can waive that.
Death image: Your signature needs some coloring love too! D: It's kind of funny in that way of coloring...My only jiff is that you should add some depth to the image to make it stand out and look magnificent. I probably think this needs depth the most because of the background having a crescent being overlapped by the Reaper, so...I suppose...Yeah.
Third character: Boy, that fellow sure is slap-happy with his sword, him and his enthusiasm. Somehow the hands are throwing me off, it's not that they're bad, it's just where do they totally make sense with the handle. Of course, I'm not in a drawing mood so this nitpick may actually be a mistake on MY part and not yours. Again with the face I'm perturbed about, but read the first image comments which makes this disturbance go unnoticed.
Myth of Gaia image: Interesting style of chibis here...but the ear to eyes relationship are too strange. This can be a whole non-issue because of the Chibi thing, but it really feels awkward to me when I see the ears being totally over the height of the eyes...