Few more randoms

Just some random doodles from recently.  Not all ideas pan out and others are just quick works for skill building.

Sci-fi mining operation I couldn't color in any way I liked.  Also I couldn't think up a fitting foreground element.  Might try something later tonight on it, might not.

 Buncha quick heads from r/redditgetsdrawn I did to practice female jawlines mostly--and two instances of boobs, though they were secondary this exercise.

 Early doodle on my Android tablet.

Possibly an even earlier doodle on the portable tablet...