Breaking down and looking it up, the Wikipedia sez that 'doujin' means a fan-derived work, which could be art, manga, computer game, movie, stationery, whatever, and that 'doujinshi' means specifically a manga. So technically they're both correct. although 'doujinshi' is the specific term (and in that case 'doujin' probably sounds funny to a Japanese speaker when using it to refer to somethign specific).

L is drawn most often from the angle of a camera looking slightly up at him from below or directly at him, while Light is directly at him or looking slightly down on him from above.