Lunar refuge

I drew these to illustrate a short story I submitted to a contest by the Spanish Instituto Geográfico Nacional, which ended up in 3rd place out of 38: https://www.ign.es/web/ign/portal/concurso-de-narrativa-breve-2022
The story, in Spanish, is available here: https://www.ign.es/web/ign/portal/libros-digitales/concurso-narrativa-breve-ign-2022

The drawings were made using mechanical pencils with 0.5 mm and 0.7 mm HB leads, and some blurring with my fingers for the lunar terrain. The colors were inverted in the second one with Photoshop, which I also used to make the shadow on the lava tube darker and the sky black in the third one. I did all three in the last few hours before the submission deadline, so they're not as detailed as usual for me. And for the rover I used NASA's Space Exploration Vehicle concept that's employed for training on Earth rather than the actual design of the space version, but I didn't have time to look up enough references for the latter.