This is the thumbnail I'm going with. Next, I decided where the lights would go.
I started working on the background.
I used some screenshots from Diablo III as reference.
3rd one is nice, good balance of darks and lights, you have a focal point with that fire and there's some nice colour variety too. Be careful with your perspective though it's not consistent throughout the image
Yo! Thanks! By the way, the reason why the perspective feels so weird is probably because of the 3 point perspective, where the Y point is located beneath the character. Thanks to that, there are some areas, like the legs of the platform that look a bit deformed. Do you think I should let my eye to the work here, or should I keep everything fixed to the perspective?
3 point is a really difficult perspective to draw. And it's recommended you have each point far off on the horizon so you don't get warping, you have warping here. Here, I drew over your piece to show you what I mean, one of the inconsistencies was that if your perspective is below the character then the angles of your environment aren't reflecting that, and a lot of your furniture is on a different plane from each other as well
Here's also just an example of what I mean by having the vanishing points off to the side so far as well, with one and two points you can get away with having them relatively close but three point does get quite a bit more complex
I fixed the ladder, so it looks more like it's leaning. Do you think it still feels like the picture is off-perspective?
Also I wanted to mention that the further apart your points the flatter and more parallel everything will become. Although what greatly affects this more is how close to the horizon your actual zenith or nadir are
I see, thanks for your help, though I'm afraid I can't change it since I don' have much time to finish. I'll try to cover my failure somehow 
If you're gonna paint over it anyway then the sketch need not be perfect, you could even just transform warp the lines into fitting the scene better
You are right, considering I haven't planned anything that is relying too much on sketches since I aim to use a much rougher, and textured style.
We will see 
Yeah xD And you have two weeks in any case! My main concern with your piece is that while the warping does distort the view of it a little, the girl also is not on the same plane as the environment. I based my over sketch of your girl on the perspective she is in, so I modified the environment, you're going to have to distort your character a lot more to fit in the perspective you have currently! take it with a grain of salt though, and if you do want to work on the perspective so everything fits it's always better to do it in the early stages as it'll save you a lot of grief and wasted time later down the line when you actually come to fixing it 
Thanks mate!
That's it for today. Next time I'll try to fix my perspective and start rendering the character.
Instead of my initial thought, that I'll be rendering the character, I started overpainting the background. Here is the result: 
Ahh you have such a beautiful variety of colours here, the greens and slatey blues in those stones are really stunning! I am a little confused with that arrow head shadow on the floor though, that must be a really strong light source - but that light isn't showing on the rest of the piece yet (aside the shadows from it, although the pedestal is missing it) Unless you just haven't painting that on yet and I'm impatient lol
Oh yeah, thats going to be tricky. 
I actually have a very good technique to add realistic lights to darker scenes and therefore drasticly changing the mood. The only things I need for that are some adjustment layers, some light rays made with point blur and lastly some ambient light.
But to use these, I'd first need to finish the overpainting which will happen in the upcoming days c:
I didn't have much time today, so I just put some smaller details in the background. Soon I'll start working on the character itself. 
I pretty much finished the background. Also, I started experimenting with lights. Which one do you guys like more?
