Chai - Fun design on your kappa! Feels like you could have spent some more time on cleaning up the lines and working out the form. Although, it works as it is right now. I like the colors you have going on, they work well together.
One thing that specifically comes to mind is the "depth" of your creature. Its presence in space is a bit off.. It feels like a flat but 3-dimensional object if you get my meaning. You need to give the creature a good shadow. With the help of cast shadows you will make us understand the placement of the flat planes (feet, underside of belly, underside of head etc.) You'll be able to give it a solid presence in space. The shadow you have now is confusing because they way you have designed things, the head is behind the front-limb closest to us, but the way the drool falls, it appears to be in front. We need a shadow to make up our mind of where things are placed. Of course I can explain this for myself but understanding the head as turning towards me, but the way you painted the shadow doesn't give this away.
Quick summary:
Lack of form makes your creature appear flat in space. Learn to use form to your advantage and things will fall into place! Form is a result of the relation between light and shadow. Understand how they behave together and you will understand form. Especially casting shadows in a convincing way creates the illusion of form.

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