Hey Silviapalara.. just one thing that i have learned a long time ago and it does work for anything... If you are sick of the project that you are working on, then you really need to figure out what you LOVE and model that! So for instance, I love fantasy things and things that could never be real.. along with VERY cool machinery/cyborgs. So thats what I choose to model
. Even if you have to do something that you dont like, try to make it funner by encorperating something that you enjoy
As for this scene, good job! Im not really the one to be giving advice when it comes to modelling though
.. so i cant really lead ya in any real direction... as for dirtyness though i would open your material for the ground (the bricks) and then open it in any graphic editing program.. and add some "almost" black (more of a dark brown) blotches to it, that are kinda suttle.. dont go overboard!. Maybe try adding rust to certain metal objects, and mildew to the textures on the wall
. That is what I would do personally in Photoshop with my Airbrush tool and paintbrush tool.
"I should call you sugar maple tree cause i'd totally tap that" haha
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