I've recently been practising digital painting and trying out different things. I traditionally used to do do digital painting through line art then painting on the colours however I'm usually kinda lazy/impatient to finish the lineart before starting on painting. Not to mention I also just can't seem to figure out how people get rid of some lines after painting while still retaining others coz my lines always seems to look thick against the coloured form.
Anyway, I've tried painting from black forms and painting in the image through tonal values alone (No lineart involved, just sketches at most) and then adding colour through overlay layers and I've found myself most comfortable with it. However, I also found its limitations like lack in variation of colour and sometimes the colour just looks weird even after colour balancing and stuff.
My question is is trying to paint like this a 'viable' method? And if so, does anyone know how I can solve the problems I listed above?