I mean, there are a lot of successful and great VNs that don't have any CGs whatsoever. The most famous examples would probably be Higurashi and Umineko, both of them got very famous and are highly praised even though they do not have a single CG (Sure, they have some in the later versions, but they were already famous by then). So yeah, as long as the writing is great, I don't think you have to worry about the lack of CGs too much. Maybe once this version goes around an artist might volunteer to finish the CGs?
Eitherway, good luck with the development of the game. I am sure you will be able to deliver something great. :)