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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:
charlie
nikkicrescent
Xorbaxx
redleatherart
Red Crow
GreenTea466
SoloM
mayamayumaru
zetosu
kirstine
conquest_comics
ReleaseIsAPrivilege
BestElysium
Unknown Modding Group
The Hungarian Coverist
nakta
fatwagon
Kat
SKY3
accelart
Rdash3d
Unforbidden
Upstairs
TakazumiShan
thespherehunter
audioharlot
Shnappster
ThatCatsuitGuy
鱸ボストン敏郎
snibbits
KamuoGame
richgfx
みーとろーふ
THEMISTERMANTICORE
SedEcuStudios
RUA
Phia’s Sanctuary
MoeU33
FROG
Whiterabbit 95