My photoshop attempts

Here are my latest attempts at photoshop - as pinned up for yesterday's 'crit'.

and a before and after sketch...

original sketch with hand-written annotation. Then below a cleaned up version without the annotation and a startlingly blue sky. 

photoshop - spot the difference? This version took me an hour  to produce from the original. It would've been quicker to trace over and re-colour by hand.