The surface of Pluto and its hazy atmosphere, as seen from beyond.
Reference: https://photojournal.jpl.nasa.gov/catalog/PIA19948
Drawn using a mechanical pencil with a 0.5 mm HB lead, with colors inverted in Photoshop. For this one I ended up focusing way too much on reproducing every single geographic feature, and this not only meant a lot of extra work but I also neglected the illumination gradation that would've made it look more like an actual sphere…