thats a nice vector :)
but:
the colours are a bit grey, id add more saturation;
the bright white spots no the sakura tree look very weird
the colouring needs a bit more depth, id add a few more layers for shading :)
lines look very weird, they're not straght, and in some places they look too thin and in other places they look too
thick
but the tree is the strong point of the vector i guess :D
nice job ^^