Out of the shadow - still life practice

My room is so dark, that the only style I can paint in is Caravaggio style. xD

Since I really want to learn how to paint and often ask my traditional art teacher for feedback, I got a task to work with still life, focusing on colours. It's still problematic for me to work with them in general, but she noticed, that it was the greatest flaw of my works. So I'm painting))
Here I still failed with colours, but I like it anyway.

Oil on carton (hell, it sounds so... stupid xD)
circa 2 hours