Not sure if I am asking this the right way, but one of the first issues that I am running into with Visual Novel creation is maintaining the same Art Style between the backgrounds, characters, and especially "items".  Am I missing something obvious here when it comes to sourcing these items, or is it just something you gauge by eye?

While my current projects are more like prototypes, I am totally open to paying for art in the future, but I'd like to better understand this all so that I even know how to word what I am looking for... haha!