One thing I sometimes like doing is putting a multiply layer on top of my pencils and colouring that instead like
. That way I get the colour and the sketch. Do you have a program that has layer blending modes in it? You could try that too. Photoshop and Manga Studio (modern)I know have it. Not sure about Sai, and other programs.
I was gonna say I have SAI, for layer/blend technique I usually make the sketch layer on multiply so a different layer could color right through. Yet again it requires a computer and internet to submit it if digital. Hope that answered your question~