Pikachu

So...
Im buying a tablet soon :3
and I borrowed my brother's wife's A4 sized tablet to try out
and... this is my first time using photoshop and a tablet ;_;

I didn't know how to draw on an existing image.. So i just drew from scratch ._. Though I kinda liked how it turned out despite knowing nothing about photoshop.

I was actually stuck for a while since no matter how hard i drew the the colours never actually came out LOL. then I panicked. but i soon found out that the layer was locked?
well anyways, I still have SO much to learn about photoshop, and i would appreciate it if you would give comments on how/where I could improve; and how to use photoshop to do so xD!

Photoshop on a mac btw.

Reference picture:
[link]