Not only show what you can do. You know, you can't say "is this good" in a graphical aspect. You need to see the whole picture (got it? picture! ehehehehehe...).
A graphical style is the game itself reflection, visual representation... whatever. A game is made from an argument (which consists of several other parts), graphical stuff, music, gameplay, and a bunch of things that doesn't fit anywhere (?). Surely, hand-drawn always have some charm, but you need to consider if the graphics you're trying to make represent your ideas correctly. Also how hard is to make them, and then it's just being consistent, not making weird remixes like pixel art with hand-drawn (unless you DO want to, and plan how to make the mix).
Anyway, thing is, it's hard to say if something works without any "physical" evidence, ideally everything works,
Orochii Zouveleki