The following is only my personal opinion and I hope that you think it is more helpful than critical because that is how it is intended:
Candle Arr. - I feel you needed more flowers round the bottom, you have put september there but putting more spray carnations or other coloured flowers would have made it fuller
Pomander - I dont like pomanders in general and personally avoid them like the plague but you've achieved a nice round shape and thats what pomanders are all about really
Buttonhole - Theres nothing wrong with your buttonhole and your wiring and taping looks neat and thin, I would personally have looped some bearsgrass at the front or over the rose to make it a bit more interesting and followed through with ends of the grass at the back
Front facing Arr. - Again its the bottom of this arrangement that I feel needs more flowers. If you had followed the lines of foliage more at the bottom with your flowers it would have made it less "fan shaped" and more balanced.
White rose Arr. - Dont know whether this is an arrangement or a handtied but either way it looks nice

Hope you are not offended by anything I have said, I like people to tell me what they think of my work because I think that is how you learn (and im thick skinned anyway), and trying out different techniques and methods can only be a good thing, I think. Hope you feel the same.....