Art

We were told by Mr. Ampri to make a figure that used cubes. And we were told to paint it with light and dark technique. It is a technique to blend light colour with dark colour so that it would blend nicely and create a gradient of colours. And this is what I've got:

I got 95 and I'm quite satisfied but it has no variation of colours (like my teachers had said) and the pencil line are still visible. That's why I need to improve too.