Here's how Curiosity looked 7 years ago and now
Ripples On Surface Of Martian Sand Dune
Sunset Sequence In Mars' Gale Crater
Curiosity Rover Finds And Examines A Meteorite On Mars
Curiosity's Color View Of Martian Dune After Crossing It
Curiosity's Dusty Selfie At Duluth
First Sampling Hole In Mount Sharp
Multiple Layers Of Mount Sharp
Martian Rock 'Harrison' In Color, Showing Crystals
Jake Matijevic Rock
Getting To Know Mount Sharp
Wheel Scuff Mark At 'Rocknest'
Curiosity Took Dozens Of Mast Cam Images To Complete This Mosaic Of A Petrified Sand Dune
Curiosity Self-Portrait At Martian Sand Dune
Remnants Of Ancient Streambed On Mars
A Mudstone Rock Outcrop At The Base Of Mount Sharp
Curiosity Tracks In 'Hidden Valley' On Mars
Outcrop In The Murray Buttes Region Of Lower Mount Sharp
Strata At Base Of Mount Sharp
Mount Sharp Comes In Sharply
Mars Rover Curiosity In 'Buckskin' Selfie
Resistant Features In 'Pahrump Hills' Outcrop
Curiosity Self-Portrait At 'Windjana' Drilling Site
Having Reached The Base Of Mount Sharp, Curiosity Captured This Image Of Its Rocky Surroundings
Curiosity Rover's View Of Alluring Martian Geology
Bone Up On Mars Rock Shapes
View From Mars Orbiter Showing Curiosity Rover At 'Shaler'
Layers At The Base Of Mount Sharp
Focusing The 100-Millimeter Mastcam
Curiosity Visited An Area Named "Fracture Town" Which Contains Many Pointed, Layered Rock Formations
Curiosity Arrived At This Active Sand Dune Named "Gobabeb", Which Is Part Of A Larger Dune Field Known As "Bagnold"
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BTW, I'm not sure there's a dense-enough atmosphere on Mars for a drone to fly.