This is a great character design! I love how you play around with texturing here as well as color. It's simple and eye catching.
The only draw back I fee like is the flat white and skin tones without any shading. It does work well in terms of keeping this simple. And that is a good thing. It's just after those eye catching colors it seems like the work could use a little more depth. If it is meant to be a simple icon though, the simplicity works just fine.
All in all very good character design and great use of color to catch the eye.
First off- the sketchiness and use of more traditional are style brushes is very well thought out. I really like the shading as well, which isn't something you can get just by drawing over a reference. The different textures also work well to make it look more like fur than just digital brushwork.
The only reason I docked points for originality is this is a practice work, as was mentioned in the description. It's honestly a very good piece and I feel like could be a very good finished piece.
This is a very good start all said and done. Great job!