Stroke weights & Styles

http://www.homeeducateinthesunshinestate.com/blog/how-to/how-to-create-multiple-stroke-path-adobe-illustrator/
I gained useful advice on techniques and effects which can be applied to image lines in my designs. Whilst it is easy to apply multiple strokes and variation of weights and caps on the lines it is also easy to get carried away and apply too many techniques to the one image.
I think used carefully it can give new dimension to the image and make the lines stronger and well defined if used in co-ordination with other effects and elements.