Ok, I am going to listen to some advice and leave the bridge as it is and do it while painting. So this is the final line art. Now - colours to come 
Some things will definatelly change while messing with colours, but this is the base I will use.
Good luck all, and thanks for comments and advice
another thing that came to my mind was that you could make the scene at night and put the city lights on, as you already have a cityscape there. i did’n mention that bacause i noticed you wanted to make it at sunset which also creates a nice mood. but then again you can always try that as well with stars, moon and a ligh glow coming from the city. but it’s your choice and i don’t want to create any mess here in your process hehe. just a thought…
first of all, as far as the concept is concerned, i really LOVE the couple who appear to be in love. of course without specifying who takes the role of master, or servant. because many times, the notion of master and servant has no straight line drawn between the two.
now to technical aspects of it, knowing the fact that its still in early stage, BG could use stronger illusion of depth. having vanishing point in the middle of the image do force strong sense of depth, but if you dont get all the technicalities right, those who view the image can point out flaws of the bg easily. I am not suggesting that you must be extremely technical with your art, (after all, its art, and you can express whatever you want) but if you intend to mimic the reality, following the stricked rule of perspective theories are very necessary.
most of the buildings are okay, but the bridge doesnt really blend well with the rest of the perspective settings.
http://www.messstudio.com/bb/viewtopic.php?t=805
this link is little perspective theory i put together, and it might help you to go further than just using vanishing point and horizon line.
overall, i find this picture worth watching and see where you take it from here. love the concept, and i wish you very much luck on this challenge. and challenging yourself! ^^
Marcheen - thanks for the idea, it is cool, I will think about it
HOON - I am glad you like the concept ( I like it myself too). Thanks for advice on perspective, browsing through your tut, thank you, I really appreciate it
Good luck to all 
As I am a little bit stuck with my other concept at the moment, I am posting another quick one I came up with today. That is a manipulative woman, who has captured a man, and is bending him at her will. A little bit of a mystical touch to it all. The man is in the ball above her head. She is not supposed to be good
Trying out a light source as well.
Best wishes,
Edite
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