I never used to work in an actual sketchbook. I just sketched on seperate sheets of paper. You might think that doesn't really matter, but I think it does. At least, to me it does.
To be honest, I used to be afraid of working in a sketchbook. I thought that if I made too many bad drawings in it, the book would be ruined, and then I would have to throw it away. (Don't worry. I've seen the error of my ways...)
Nowadays, I hardly draw anywhere else but my sketchbook. I find it pleasant to let the different drawings and preliminaries for projects accumulate in it. Sometimes they start influencing one another. A composition for an old project might be just the solution I need for the one I'm working on today.
Here are some snapshots I took from recent sketchbook pages. The first series were actually done for another project (one I'll be able to show you some time soon, I hope), but I ended up not using the idea there. When I wanted to start making the poster for the Industrial Music Festival I posted yesterday, I remembered these sketches of anatomical imagery.
The two images in the next gallery are from the same batch of sketches as the previous ones, but I ended up actually using these in the poster. I just scanned them in and started playing around with them, changing their seizes, copying them, erasing some parts and adjusting some others, to get to an image I was pleased with. If you compare the pictures here with the poster, I'm sure you can still make them out...
The final gallery shows sketches I did for some of the other illustrations I posted recently. These were especially made for the project at hand. More often than not, I'll just scan the sketches, even the most flimsy or crude ones, and start working on top of them digitally. I'll hardly ever redo a sketch to make it look better. I don't believe in redoing things. Most of the time, there is something in the sketch which already makes things "work", and redoing it would just kill that. The trick is to just keep working instead of reworking...