What can I improve?

I was never much of an artist, and it is painfully annoying to draw on my phone with my finger, but here is a little thing I made for a friend! Something feels 'off', is it the lack of a background? am I not suited for this kind of art style?

I was never much of an artist, and it is painfully annoying to draw on my phone with my finger, but here is a little thing I made for a friend! Something feels 'off', is it the lack of a background? am I not suited for this kind of art style?