Going clockwise starting from the top left, you have:
1 x Tri-Pod laser cannon leg (£Not a lot)
The front end of a Speeder Bike (£1?)
An AT-AT chin gun (£20? - Check eBay as these are sought after)
Millennium Falcon gunner seat (£5)
An AT-AT light bulb cover (£15? - Check eBay as these are also sought after)
The gun support from a Rebel Transport (£Not a lot - £2?)
The gun from a Rebel Transport (£Not a lot - £2?)
The front gun from a Darth Vader's Star Destroyer Action Playset (£15? - Check eBay)
Darth Vader - Rare one-handed variant ;-) (£0)
Luke Bespin dark hair with felt tip highlights
(£1)
Luke Bespin Blonde hair (£4)
Non Star Wars figure (?)
4-LOM's chest plate (£4?)
Hope that helps