Milestones 2017 is the subsection for sketchbook fillers from 2017. It contains Patreon milestone images (not all of which can be described as pinups) crossposted in the sketchbook section, which Dan started doing in October 2017 after previously posting them on Patreon instead of the sketchbook.
It is 4 pages long, starting with EGS Sketchbook Comic for 2017-10-31 and ending with EGS Sketchbook Comic for 2017-12-25.