Placement of acoustic foam...advice

Following my dilema.. well not realy dileman .. but wanting to have a better mixing envoronment... ive been reading som articles on how u can enhance your listening space... it seems that puting some acustic foam left right and above in situated places can improve this.. so i have taken some pics.. and BERY ROUGHLY drawn were i thought could be enhanced.. what u think.. http://www.pariahband.co.uk/random/P2250021.JPG http://www.pariahband.co.uk/random/P2250022.JPG http://www.pariahband.co.uk/random/P2250024.JPG i havnt figured out how large they should be.. but i was thinking about 1 metre squared... im also gana have 2 monitors next to the ones in the pictures... but on proper stands... I realise that the glass could be a problem.. however the Ventien blind does help reflections... thanks for any help!