I like this character's design! She looks so cute and the background fits her.
In my opinion, her right eyelash should be inverted, the long part of the eyelash should be on the other side. And I think the nose can be better, but if it's your style, it's ok. Her lips are simple but cute.
I think you use the airbrush tool too much, the colors here look so soft. You should do more solid strokes, specially on the hair. And you should draw folds on the clothes so the drawing would look more realistic. I know it's not easy, but I'm sure you can do it if you practice a lot. Looking at references helps a lot too. This is just my tip, you don't need to follow it
My favorite part is the roses. They look vivid and gorgeous. It really complements the character.