1. http://www.fumira.jp/
(all page text is in Japanese, but even if you cannot read it, you can find a lot of very good pictures).
Most of the images are available in three formats - sharp colour / soft colour / black and white line drawings.
2. http://www.phillipmartin.info/
3. My suggestion - search with the Google and Yahoo image search tools. If you are not going to publish your work online, it really would be a waste of time to go farther than these. They have options for image types, too - all / clipart / line drawings, etc.
Copyright? Permission?
1. Don �t know.
2. Permission details in the site somewhere I think.
3. Down to the host-site from which you take the image.
I guess as you are asking here, you want to publish here, though.