Okay, I foolishy said that i might post a marker demo for Makk (or someone...!?) so here it is. Sorry for the crappola quality.
equipment)2 markers (50% and 20& warm gray Letraset markers)thick and thin black pens and white gouache (opaque water based paint.) You can also see the size of the final image under that stuff. this drawing was almost too small and if I do a more detailed version i will enlarge it.
1)Pen drawing with thin pen, done over pencil drawing
2) thicken line weights - looking to seperate section and define space/depth. By this stage i have a fair idea of where i am going to add tone.
In this case I have decided on lightSouce from (more or less) above. So horozontal surfaces will be white, angled sufaces light gray and vertical surfaces dark gray. (There are other factors I consider when deciding on tonal value but they are not relevant to this sample)
3) light tone added - Where possible I work in small sections. The larger the area you 'colour in' in one go the harder it is to avoid patchy results.
[img]http://www.sumea.com.au/simages2/258_markers_1-3.jpg[/img]
4)time for a cup of tea [:)]
5) Light tone complete
6) Add dark tone to vertical surfaces (sorry for the crap image quality again...that light yellow should look white!)
7) Because I have used white as a major surface tone rather than just small highlights I decided to do a dark toned background to lift/divide the image from the white page.
[img]http://www.sumea.com.au/simages2/258_markers_4-7.jpg[/img]
Final)Touchup of my messy marker work (I did this one infront of telly so there was some colouring out side the lines) and additions of small highlights with Gouache and fine brush. (I scanned this one rather than photo so the colour etc is more accurate)
[img]http://www.sumea.com.au/simages2/258_markers_final.jpg[/img]
Light to dark as the general rule for all transparent media, including markers. To break the process down further into distinct proceedures you could:
1)line drawing and everything that is black
2)fill in everything except white highlights with the light marker
3)fill in all shadow areas with dark marker (ie going over some sections of the light marker)
4)touchup and add reflected light with gouache and/or white pencil
this would allow you to focus on each tone individually. Handy if you are not 100% sure what to make light and dark before you commence. The other handy step that i didn't do in this case is to scan and do multiply prints of the line drawing. Takes the pressure off if you know a mistake is not going to ruin your original line drawing :)
thats a very handy guide there john, thanks for that :)