Play Images: Working with Colour

I am slightly apprehensive to start working with colour. It has so much influence in bringing harmony to a composition, yet so far all I have been concentrating on is the relationship of forms.

In my sketchbook, using a set of coloured pencils, I did some tester colour palettes - trying to figure out which colours I felt fit best together. It's difficult to know, however, if the ones I feel go well together myself will also appeal to another person due to the subjective nature in which we appreciate art.

I then began applying these colour palettes to the compositions I have been developing in my sketchbook, to create a series of coloured pencil drawings. I feel that these are working really well and would to create more - but using coloured pencil is too labour intensive for producing these images. I think I should move onto some other form of media - like collage or gouache? As well as maybe start working on a larger scale.