I just wanted to try something else technique-wise (I only used one brush - the round default one - and tried to only use colors rather than different layers with different blending modes). It ended up being a totally random drawing. But I enjoyed doing it (I'm not sure what I think of it though) and will probably try more often to change my way of working. I'm feeling a bit stuck with what I know at the moment, I guess it's time to stop playing it safe (-ish), and try to get out of my comfort zone.
Photoshop as always.