sketch for lady at the bus stop

I had taken the reference picture of this women while travelling in an auto... she was at at the bus stop and looked like she was waiting for nothing... a very stoic expression on her face... Its been 2 months that I keep going back to the photograph and thinking of how to approach the subject... Last night I just felt that it would be good to atleast do a rough sketch... and so pulled out a sketch book and oil colours and made this...

no where close to what my plans are but I have atleast started...