Thanks for all the advice guys (Pasis - you have more faith in me than I have). Believe me, once the baby arrive all my free time will vanish (i'm on a semi-break right now) so I'm making the most of it while I can.
Jykke thanks for the tip, but I'm not using photoshop but Drawplus X3 - it's not bad, but it doesn't quite have all the little bits and peices that PS has (including exposure correction) and has a tendency to crash if the filesize gets too big. I've put in some sea lines...any better?
All the best