Hello nj, I really do like your style and it looks really cartoony. Your expressions for your characters are really amazing too.
I think you should pay attention when you color out of the lines and where your lines intersect; when your art has line overlaps and/or coloring out of the lines, it gives a more sloppy look. I also think you shouldn't overuse the white lines because in my opinion it doesn't really clash right with the whole pictures.
Likewise, these pictures are really well done and I look forward to seeing more!