first of all thank you so much :3
Hmm, i would say practise ALOT, the more you do the more you will develop your own style and things that work for you. take inspiration with other art, not just in the style you like but in others as well. don't get disheartened if a piece doesn't come out the way you like.
My "style" used to be VERY different lol. and sometimes i hate my "cutesy" stuff and want to do something completely different.
i hope this somewhat helps,
P.S your miku and Len pictures are very cute <3