Heya! Really excited to participate in my first NaNoRenO. Been wanting to create a visual novel for quite some time. Not sure if this will come in handy, but if you're looking for some assets, you can try out Envato Elements. Only downside is that it's a paid membership but they do include photos, graphics, videos and audio if that helps.
Also, for art programs - Affinity Photo and Designer are wonderful to use for those who are not keen in paying for a monthly membership with Adobe. And for those who are on the iOS devices - can't rave enough about Procreate.