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For rooms or complicated objects, I like to use SketchUp (the free browser version) to build 3D models and screenshot them into the panels. Here is Piets piano room and how it works for the final drawing of a panel:
Oruboros3D
Asa
Ashifff
xype
ThatOneDraws
Micropixels Software
The Space Rodeo
Oreothelewdcookie
GonzzoArt
Kuroikamome
Theoddys
Lithomancer
azrayal
Jeschke Sounds
Vox Draco
TFPhoto
OwenTheProgrammer
Path
xMalin
Sofia
Amber Atlas Stories
jewitches
hornstown
tamanosuke1212
ArtisanGuild
craw
purplelemons
untyo
bspined
oblesklk
Kolas3d
rebbythewolfy
kukoi
motiyuki
Angel Light
Story_Teller
E V E R Y B E R Y
Vector AU
ionDivvy
Magnaomega