Great drawings, flyingfigment. I found your previous Sketchbook thread here:
*Your work is full of organic curves, but for stronger designs, try using more pronounced straight lines in opposition to those curves. This approach is mentioned in The Illusion of Life, but here's another good description of it.
This guy really pushes his 'straights' for powerful designs.
Others to look at for their use of straight lines are Milt Kahl and Alex Toth. Some of the best examples of this sort of thing are Robert Fawcett's life sketches, which are collected in the book "Drawing The Nude."
*Your characters' emotions are often hard to discern. For instance, in the first sketch of the winged dog, it's hard to tell if he's pleased or surprised. Further down, the reclining lion could be feeling tired, annoyed, or regal. Look for ways to increase emotional clarity with more definite facial expressions and posture.
*Some of your characters appear to be leaning awkwardly, or standing on a slope, maybe due to the way your sketchbook changes angles as you draw. This is fine in a sketchbook, but it's something to guard against in straightforward illustrations or animation. Practice establishing a consistent ground plane, with a perspective grid to show where the ground is, and some vertical guidelines to position your characters against. This will help you accurately place and follow the characters' centers of gravity, as well as ensure that the characters all seem to occupy the same physical space. Ernest Shepard and John Tenniel are good artists to look at for the way they establish a consistent ground plane.
*There isn't much use of shadow or dark areas in your drawings, and when it does appear (in the drawing of the winged dog and baby), it's ill composed: the strongest contrasts are out among the feathers, while the center of interest (at the characters' heads) looks murky. Strong composition of shadows/values won't be necessary if your exclusive focus is animation, but it will be important if you intend to work as an illustrator or gallery artist. The book "The Simple Secret to Better Painting" has an excellent chapter on composing values/shadows. Also check out the black and white drawings of Frank Frazetta
or Mike Mignola.