For the questions i have been asked about one of my pictures concerning the lines that i run across some of my images. i must preface this with the fact that this will sound more complicated in words than it is in actual pragmatic sense!!!! so forgive me if this gets long winded!!!!;-D
Basically i work the piece into a very finished line sketch, with ABSOLUTELY “NO” TONE WORK on it at all. Then i trace the line sketch in pen(this is important its in pen), then on the reverse side of the paper i trace the image off(remembering that this will be reversed in the final image from the way u are working on it when u r tracing it-i know this sounds obvious!!!!)this secondary image can be offset, or i suppose even reversed from the original image on the viewers side of the paper.(from here on in i will refer to the viewers side image,ie the finished viewed image, as the “original” and the image the over side as the “secondary”.
Across the secondary image i measure out(either vertically or laterally)small division points in pencil that correspond with each other(ie i rule the paper out, like lined paper across the secondary image). Then i stretch the paper onto “REINFORCED GLASS” this is really really important, as normal glass will not take well to being painted or sketched on, trust me i know from experience!!!!!!! Then i paint out the original image, my preferred choice is in ink, but its really down to u, completing this stage thoroughly, cos once u start the next stage u cant go back!!!!!! Then with the glass mounted image i place it onto a light box and switch it on to reveal the secondary image, which i then paint out in watercolour pencils(actually drawing with them, as opposed to applying a paint brush over the top of what i sketch out with them, u can work in more detail this way obviously being the advantage!!!!!)And hey presto there u go!!!!!!
As a side note i found out after doing this several times that this is how a holograph works to some extent!!!!!!
If you do use this technique i would really appreciate it if you send me a link, or even better a photo of the piece u do using it?