Your Typhlosion has a few errors.
1.The neck is a little too bent. Typhlosion looks as if it is looking down. Try making the angle 135 degrees.
2.The neck looks a little too long.
3.The ears look too thin and too pointy
4.Typhlosion looks as if it is looking down. Try to make the eyes focus to the right, not the bottom.
5. The eye outline at the top looks too thick. Try making it a one pixel line instesd of two pixels at some places
Here is the Typhlosion sprite for comparison.
1.The body suggests that the viewer is looking at it as the same angle as a sprite, but the head suggests a side view.
2. Skymin needs a longer nose.
3. The eye's outline looks bumpy, try making the eye less tall.
4. The neck would look better if thinner.
5. Try making the dot at the end of the nose bigger.
6. Skymin has Mohican-like, not bush-like 'hair'
7. Try to make the sprite brighter
Here is the Skymin sprite for comparison
