Hi! I've been out of the planescape multiverse for a while, but i've recently made a drawing for the outlands. Yeah, i know, the spire -too much spires around-, but i tried to focus it on a different (or at least unusual) perspective.
http://iburo.deviantart.com/art/Center-of-the-Multiverse-137855406
Hope you like it!
Very pretty. I like how you captured the sunset look.
I like it ... but I don't think The Outlands has a sun.
I like how the spire has a more spiral and organic look to it.
And it's vague, whether some planes have suns or other celestial bodies or not.
Well, I admit - I checked before posting that 
'So, you want to know why the Outlands have both day and night when there's no sun or stars in the sky? What are you - Clueless?'
- page 5 of the Player's Primer to the Outlands.
i really like the color, especially the river as it reflects the sunset.
I got it all wrong.
I wound up believing in words the way a scientist
Believes in carbon, after death.
- Larry Levis, excerpt from Winter Stars
thank you very much for the comments 
i must say, although i'm sure that sigil has no sun and there's some kind of natural system of lightening, i didn't knew if this included the outlands o.o
nevertheless, i imagined the scene and though that it might look ok, since every picture of the outlands that i saw before are pretty much the same
but yeah, thinking more about it perhaps it has no sun xd
Sun or no sun, that looks great. I'm sure that there could be some sort of rational to the sky becoming that beautiful for a little while.
Belief and Desire - that's all you need to change the multiverse berk.
That's beautiful. I like the pale white forests.