Hello there! This might be my first post but this topic is the one that got my attention the most. I must say though this is a really well done job!
I was also wondering if suggestions were open, it could actually be possible to try with the planets for example TrES-2 b, which is of course known for being the darkest planet ever known.
Example pics:
And HD 189733 b "Isis", which is by far my favorite planet thanks to its beautiful yet deadly looks.
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And while we're at it, I also wondered if any of you knew a certain John Whatmough, owner of the new deactivated website called Extrasolar Visions and although the artworks are old, perhaps it is still possible to take them into consideration for inspiration.
Here are them all:
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16 Cygni B b (Another of my favorites)
Thaphao Thong (47 Ursae Majoris b)
Janssen (55 Cancri e)
Galileo (55 Cancri b)
Brahe (55 Cancri c)


(Summer looks)
Lipperhey (55 Cancri d)

(Basically Jupiter but upside down and more visible rings..)
70 Virginis b
79 Ceti b
Gamma Cephei A b

Gliese 229 b
Gliese 777 A b
Gliese 876 d

Gliese 876 c
Gliese 876 b
Lalande 21185 c
HD 188753 A b
HD 28185 b
Tau Böotis A b
Saffar (Upsilon Andromedae b)
Samh (Upsilon Andromedae c)

Majriti (Upsilon Andromedae d)

(That's all I could find, apologies)
And that is all, feedback or just thought are appreciated!