I like [@Ey Iran]'s post as he has some valid points regarding image usage, but I'd say the most abused for the "lazy writer" are images to convey your PC's or NPC's appearance, or story location(s). Imagery should [i]enhance[/i] an already well written description, not replace it, and I find too often a picture on a player's CS under the "Character Description" section with no text to support it as though the author is saying "No need to use your imagination here, folks!".

Just my two pence...