fish keeper: I like the sebastes and the rattlesnake. I like the technique you have used to draw the scales on the snake.
The Sebastes could use a few darker areas to give it depth around the fins and gills, other than that, it seems a very accurate representation.
Colored pencils can be tricky because they don't always cover white paper very effectively... especially if it is regular copy paper. With art supplies, the more expensive one's are genreally higher quality and easier to work with. Good color pencils are worth the money, they are softer and have better pigments that blend better.