Do you like my Growlithe drawing?

Actually, this is very good. It sticks very true to the pokemon style... However, something to think about when drawing tagahanga art is to include your own sense of style while drawing it to make it your own.
The only real payo I have other than that would have on this would be on the shading. Though this shading is very nicely done, it could be smoothed out a little more. I suggest you become familiar with shading gradient and value and keep depth in mind while shading while paying close attention to light source. These are terms that I can't really explain myself, but I encourage you to do some research on the subject. Again, deviantART and youtube are great places to start.
I suggest looking up markcrilley on both websites for starters. He is a great comic artist who does drawing tutorials for beginners that are easy to understand and follow.

Si senorita. Mucho good.
Sorry, I suck at Spanish. But yeah, for only ten years old, it's awesome!

It looks good for a ten taon old.
What it is it? It looks like some kinda pokemon...
or something.

¡Muy bueno!

Wish I was that good.