Thank you for the very informative comments! No wonder i heard you won some kind of award....
I guess in my case, my purpose is just to get a sharp and clear image with proper exposure and reasonably well compose shot with the constraints i have.
I took these shots 'tactically' if you know what i mean. I certainly agree with you about the tilting. I did it because i was severely blocked and i was trying to cramp everything into the frame to show 'something'-many models? On 2nd thought maybe not worth posting..
I also agree regarding the words in the background. I think i have one or two shots with a clear view of the words in the background and the model but i think the model is OOF or overexpose or ...

Again, if i can move freely to get a good spot i guess i would not end up this kind of shots. My focus is on her overall clothing and her pose. I only have 100mm.
My shots ever got mess up when i use Av mode. Problem with Av is, if the dress is too dark or the background is too bright/white then i need to adjust the compensation manually sometimes. I think its easier for me to adjust shutter speed on the fly. 350D metering/adjustment maybe more challenging?

Its much easier to shoot with faster shutter in this case. Base on past experience, i use the same shutter speed and i already lowered the iso from 800 to 400 but remain the same shutter speed as in the past. But didn't realise it is much brighter this time.
Thanks ..again...
