Aw, Pikachu is really cute.
And I like how You misspelled his name as apparently no Starbucks worker knows how to spell names. Or so I heard, I'm not spending five Euro for a coffee.
Anyway, keep working, I really like Your art and You don't need to improve anything on it because it is very beautiful! And I think it is really nice that You are responding to the comments, not everybody does that, whether they have few or many watchers. So keep being You!