I work almost entirely digitally on a Cintiq monitor, so there really aren't any pencil versions of most of my stuff any longer. Really, any compromise of detail comes from the final resolution of the intended piece. These were done at x2 the game's actual resolution, which was still fairly small as they are ultimately just banners.

As for the length of time for each, I think it was maybe a work day and a half to two days per? Maybe less. The foxes well all done in a day, I believe. The backgrounds had much of a day for concepting and then a half day or more for doing the final.