Recently, I have been creating splash images (drawings of one or more characters posing and filling the image) of Venge and crew. These are the closest I come to sketches. I use them to create and understand the depth of the character from many angles. Also, to get a feel of how well they may translate to a page with panels. I already notice that some of their 'costumes' may be too 'busy' and have too much detail to accurately recreate in a smaller panel.
Case in point: SangGwen's Bloodletter Blade is damn wicked. This has been one of my favorite creations, but the unusual structure of it is difficult to recreate in a drawing without confusing the reader. Above she is shown wielding it; and to the right is my original design in a modified image to bring out it's detail. So, then, I have been creating more images of it, in use, to see if it can still be a reasonable prop.
But, mostly, I have been creating images of Venge, using the time in between calls at work. I have one more idea I want to convey in an image before I move on to producing my first pages for this.