Don't know if some of them got proposed already, but here are my suggestions.
Dryio Flyuae ZI-T B6-13 1&2
Two water worlds orbiting each other near Jaques' station.
HD 148937 - 3
9.77G planet... Who doesn't wanna see this?
Sol - Ariel
One of my favorite planet in this game. Although that was taken before Engineers and I didn't check it since then.
Bubble Nebula
Do you really need details? It's absolutely beautiful!
Messier 78
Close to Bernard's Loop, pretty small, but still cool!
VY Canis Majoris
Why? It's so huge I could still scan it from 0.24ly away. I gave up going farther after this point.
Veil East Nebula
Pretty
Also... Beagle point...? Anyone crazy/brave enough?
Dryio Flyuae ZI-T B6-13 1&2
Two water worlds orbiting each other near Jaques' station.

HD 148937 - 3
9.77G planet... Who doesn't wanna see this?

Sol - Ariel
One of my favorite planet in this game. Although that was taken before Engineers and I didn't check it since then.

Bubble Nebula
Do you really need details? It's absolutely beautiful!


Messier 78
Close to Bernard's Loop, pretty small, but still cool!

VY Canis Majoris
Why? It's so huge I could still scan it from 0.24ly away. I gave up going farther after this point.

Veil East Nebula
Pretty


Also... Beagle point...? Anyone crazy/brave enough?