Nice background again, Tatzel.
I appreciate that it's been quite a few days now, but alright, I can see that I went overboard back there; At the time it felt to me as if princess brothel was more making a personal attack than constructive criticism - if that wan't the case then I apologise.
Dire: I don't want you to think that I'm fixating too much on your comic panel back there (because - don't get me wrong - it's very well drawn) but I came across
this thing done by Ben Caldwell which might help you think differently about how you approach your comic panels.
Avoiding unnecessary distractions that draw the viewer's eye away from the action is something to avoid - and I feel like the doorways and van behind the 'bot's head are doing just that. It's not a crime to minimise your background detail/omit unnecessary detail to avoid causing distractions like doorways and things like that which can create a sense of anticipation in the reader, i.e:
"Oh there's a doorway in the back there. I wonder if someone's going to step out of it in the next panel?" - if you catch my meaning.
I think that - once you've established that your story is set in a city, village, mountain range, aboard a starship or whatever (this is normally done with a panel very early on in the story and/or when the story changes location) - you needn't worry too much about reminding your readers of where the action is taking place by spending a lot of time drawing the same background details over and over again. Readers are generally smart enough to know where the story is taking place once it has been introduced; Details like doorways and vehicles need only be drawn in if they are necessary to the story, though if you feel that blank walls/shapes aren't suggestive enough of a city backdrop then you could also use posters or grafitti to give a more 'urban feel' to your background.
Of course you might already know all this but I guess this might help other people with their projects so I thought I'd post it here.