As you can see above, Matthias looks like a small point compared to the ISS. This is how the astronauts are seen during a spacewalk, captured from Earth through a telescope. Also, in the image of the photographer Sebastian Voltmer, it can be seen Canadarm2 which is a robotic arm installed on the International Space Station. 

About this spacewalk: 

This is the latest spacewalk on the ISS. The spacewalk was made on March 23, 2022 by Matthias Maurer and Raja Chari, and  was completed after 6 hours and 54 minutes at 3:26 p.m. EDT. 

"Maurer and Chari completed their major objective for today to install hoses on a Radiator Beam Valve Module that routes ammonia through the station's heat-rejecting radiators to keep systems at the proper temperature. The crew members also installed a power and data cable on the Columbus module's Bartolomeo science platform, replaced an external camera on the station's truss, and conducted other upgrades to station hardware. The pair deferred a few secondary tasks, such as torque resets and cable routing, to a future spacewalk." said NASA.