I deserve feedback to Wiltherel -
I think you make neat and fun Knuffel, you are good at balance, evolution and design. I think the over all most appealing to over user base here would be your mermaid. She has bright colors and a color theme. How ever I like your more tougher looking knuffels. X3
If I were to improve on something in your art would be coloring and line work to make them more appealing to people. (not saying they are not, Like I said you make good knuffel) People here look a lot into the art quality. So I feel you need to work on your shading contrast of light and dark shading. Mostly just to make the darks a bit darker to make the shading more rounded. It tends to come out a bit on the flat side.
You could add some more shinny to your knuffel, Mostly in the hair, adding some highlights would give the knuffel some more life.
And lastly you could try messing with the line work a bit. Its all one thickness. This would be something you would have to mess with, but can help a long way and I think it could help you. How I think about this is to make the line thicker on the outside of the over laying item. SO like
http://fav.me/d4xij6z its Felis head, its arm, Zedof's hair, his face, Felis foot, Shoulder, Tail. I don't know if you are getting that. XD But it helps push and pull things apart and make your mind see better what things are.
Again, I think you make neat Knuffel! Don't let feedback get you down. But use it to improve on. Keep Rocking on! =3