hello guys! new day new drawing! I've started with the composition and general values, though I'm not sure if the lighting /shading is alright. What do you guys think for now? This is just a rough sketch that should show an idea of the scene I wanna create. Once It's done right I'll re-do it with more accuracy!

This looks really amazing so far! As far as composition goes I think it's really good but regarding the values I would try to darken some spots to create more intense contrast, in order draw the attention of the viewer a little more into the picture. Besides that it still looks really interesting and you did a great job!