You should know this guy from his BRILLIANT song 'Brother'. Quick watercolour painting I did last night - I havn't tried doing a more proper portrait with the watercolours before so I'm quite happy with the result (even though the hair and shirt did not turn out as planned) - took about 2-2.5hrs
Thankyou!! haha well I'm still trying to figure it out myself lol, the only thing I could think of that would be advice-ish is work in layers. So do a really light first layer then go over sections darker etc. to get it how you want don't think that really helps though haha