The wp:lead should summarize what's covered in the article. Assertions need to be cited. It's not enough to say "it's in all the sources". If something is introduced from somewhere else it is new to the area not new. Captions to photos should include wikilinks. It is not appropriate to expect the reader looking at the picture and it's caption to hunt down a link the article text if they want to link to what's pictured and captioned. Wp:image makes clear that illustrations are important to include.