I know nothing about colour, so I'll comment on the rendering - the part I have the greatest issue with.
Like I say to other people - treat shadow and shade with the same importance as the line, proportion etc. I think you need to take a step back from colour and do studies with pencil and charcol and critically look at the way light acts on form.
I got this great excerpt from a Robert W. Gill book on perspective "Light is needed to see and object, but in reality, it is only the shades and shadows created by light that are used in the rendering of an object". So, learn what shadows and shades are and be really critical when you render an object.
Some pointers -
- choose a your light source and stick to it
- make use of reflected light.
- use a greater range of values
- use shade and shadow in your work, but make it clear what is what
Hope that helps

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