A very good start, it looks very adorable. :>
I got a few things to note:
The lineart is a bit rough and thick in some places. Just let pixels that are part of the lineart connect diagonally be, when you try to connect them using extra pixels it will make the lineart look jagged and thick.
I feel like the main body and the tail could use a little more shading, as there doesn't seem to be that much depth. The shading on the brownish part of the body could also benefit from having a bit less contrast it's currently very sharp and looks more like a seperate color pattern on the body due to the huge difference in contrast.
Otherwise I got to say, good choice of a color palette. it's pleasant to look at.