Ok, here's the final Image. Hope you like it.

And some story behind, required by the organizers:
I just wanted to catch that interesting moment when suddenly, something unexpected, is falling down from the sky in the middle of city street. I chose the night time becouse I think that city by night looks very spectacular in general (with all those lights and reflections).

That's all, thamks for watching an support. Hope you enjoyed it, see ya in next challenge ;)

thanks for comments. Yes I know that more polished version lost impact of the rough sketch, but to be honest have no idea how to polish things without loosing that "something". Added some space behind police car. There'll be some people around for sure -on the next (final) update.

@ChrisThatGuy: yes I know what you mean.

Hope It's better now. Added some blue ambient light to make background cooler and brought heli more to front. Now it's time to really focus on the heli and make it more defined..plus some changes on tarmac texture..

Thanks for feedback. Added some neons and wokred a bit on the shops in background. Also my first attempt to draw a car in motion in foreground -not something I'm happy with, but hope the second attempt will be better :)

@clos: pice of cake you say.. :) Hope you're right :)

Brought little more light in here -especially to the ground. Tarmac is usually bright becouse of lanterns standing along the street. Also made background more calm, cause it was to strong competiton for the heli -the most important object in scene.

@angwa_falmar: thanks! yes, the heli covers up the background -my task would be to make it worth hanging in the middleground :)

changed camera angle a little bit to make it little more dynamic, added details here and there -mostly on the heli

lync: thanks, glad you like it :)

I was trying to find best place for the helicopter and here's the result. Not sure about the scale yet, but will tweak that later. Still lot to do left, but this weeknd I'm gonna work really hard to get close to the "final image" as much as possible. Wish me luck ;)

Ok, so what I want to do is a city street by night with a helicopter crush in the middle. Here's quick sketch of the environment so you have the idea of the scene feeling..