Except even with credit, the person reposting is a) violating the TOS of Pixiv. ("Prohibited acts: ... Reprinting of image data from this site without the creator's permission.") and b) violating copyright law (re: Copyright of images "All image data posted on this service are the copyright of the user who created the images.") and c) being rude as shit, because it's accepted in Japan that you do not repost images without express, blatant permission.
It doesn't matter if you (general you) give credit. You shouldn't repost the art without asking first. Not only are you violating Pixiv's TOS and the general culture of the website and Japanese fanart sites, you're violating their copyright. And they could legally report you to Tumblr or whatever other site you're uploading on and potentially get your blog deleted.
no subject
It doesn't matter if you (general you) give credit. You shouldn't repost the art without asking first. Not only are you violating Pixiv's TOS and the general culture of the website and Japanese fanart sites, you're violating their copyright. And they could legally report you to Tumblr or whatever other site you're uploading on and potentially get your blog deleted.