Hokusai was a celebrated exponent of Ukiyo-e (floating world) Japanese woodblock printing and a painter. Landscapes formed a large part of his work, probably the most famous being '36 Views of Mt Fuji'.
some are but some are not
genre
Prevailing theory is Album Art
genre
artists make art, they sculpt, draw, paint, sketch, and other things that fall into the art category
Self-help or Art and Creativity.
Ikea has some really nice prints, frames, etc., and they're really reasonably priced. www.ikea.com. You can also search www.etsy.com! The art category is here: http://www.etsy.com/category/art?ref=fp_ln_art. It's hard to pick out art for other people, though - I'd just search around and see what you like.
In Trivial Pursuit the category Arts & Literature is brown.
Broad category.
He only changed history in the art category. he changed how people saw art from the naked eye, it is a very interesting thing if you study him.
Museums and art galleries usually sell prints of famous art works. There are 'clip art' collections on disc that can be purchased, and most have a landscape category and an Old Masters category. These images are all safe to use for reproduction without any copyright issues
On almost every category for example the art of trolling there is an upload button on the top of the page.