Hello, welcome to Pixelation.
Solid design you have for the character, your previous experience is apparent. Main issues to me are:
- character feels a little flat, mainly due to weak contrast
- excessive number of colours used (27). You could drop you palette down to 8 colours or so easily.
- Lots of jaggies around the silhouette. Some areas work really well, such as his right ear (our left), but his left arm and the back of the head are pretty rough. Perhaps softening the value of the outlines towards lightsources could help
- Purple shadow tone is jarrying against the blues, both in sudden hue shift and value drop. Maybe harmonise that transition a little more. I'd even lower the saturation of the purple.
Looking forward to updates!