I like it very much, it's cute! My favourite parts are the lovely smile and cute little paws :3 What you could improve are the outlines - they would look better if they were more smooth. I don't know in what program you draw but if there are layers you can always track after your initial sketch and draw the lines more smoothly. Another thing is the opacity - the background shows from underneath the drawing and it looks distracting. Draw your characters on 100% and it will look better. If you want to add shade you can change to a darker shade. Then the darker lines under the ear and near the belly wouldn't happen.
Anyway - these are minor technical issues and the character itself is lovely! Keep it up!
This is a really cute drawing! I love the actual image itsef, but feel it could be improved upon in a few ways. First, the line isn't very smooth. This could be fixed by using a program such as Photoshop, Illustrator, or Paint Tool SAI (to name a few) to trace the original lineart and make a new, smoother version. It wouldn't take too long, and it'd make this cute little guy even cuter! You could also reduce his opacity levels; right now, you can see your background through him, and it detracts from his shading slightly. I know this is probably just a quick sketch, but hope I helped! (: