Lineart

This is the first example of lineart I found, it's very simplistic and clean and made up of simple shapes, it wouldn't be much of a challenge to colour in. the lines are also all one size which add's to the simple bold look associated mostly with children's art as it is very easy to tell that this is a dolphin as well as the over exaggerated expression makes it easy to see how the dolphin 'feels'.

This lineart is far more realistic and detailed, there's also a good variation in line with which makes things like her lips and eyes stand out. It looks like it's been traded over an photograph but it still makes a good lineart as although some of the detail and the shading had to be remove it's still recognisable. The expression is a lot more human as well which adds to the realistic look, but, in my opinion there should be far more definition on the eye's and less on the eyebrow's which overshadows the eyes a lot being the thickest lines there. It would look a million times better with lines around the edge of the eyebrow instead, not blocked in, and the lower eye lashes drawn in to push the eyes forward. 

This example is far more simplistic than the last and far more dramatic. The lineart doubling as shading really makes the image stand out with the high contrast and give the image a really dramatic feel. Unlike the first two images this has a lot of straight jagged lines which again adds to the feel. 

This lineart is slightly more detailed as it is of a human being instead of a machine, it's still not as detailed as the realistic lineart but it's bold and easy to workout whats what. The line thickness doesn't really change that much and things like hair and cloths hardly have any lineart at all which is understandable as it's lineart for a cell shaded anime image where only really important folds in cloth and such are shown. The image has good impact though with the extra thickness around the eye's and edges which make the image a lot less 2D.

This image is probably the most detailed even though it's still anime style. The line thickness doesn't change much but it's okay as it's a calm themed image, and where the line doe's thicken/thin it's very effective, as like in most anime images the eyes are the main focus having the thickest lines, this looks really nice although with all the detail on the cloths it would be nice if they were a bit more detailed.