what kind of comments are you looking for (technical or compostion)?
seems to me you are quite competent with your camera.
technically: #1 and #2 quite eaily achived by using macro (flower mode)
#3 correct use of spot metering to get correctly exposed sky. nice blue..
composition-wise: #1 and #2 are repeats.. no story and subject to tell.. other then being a rainy day and having messy spots on the window.
#3, no subject as well.. maybe the cranes.. but what about them?
maybe you can consider framing your silhouettes according to the rule of thirds to get more sky
and erm.. you shooting thru a window for #3? the window seems rather dirty.. else it means your CCD/Lens is dirty.
Keep trying! Keep posting! We're all here to learn!
Pai, I did resized the images as required by the forum rules. The original images are in 1600x1200 resolution.
yanyewkay, thanx for your comments about the technical and composition. The pictures were shot thru a window and I admit that it's quite dirty. I'm quite new to the photography, how do I improve on the composition? Are there any websites or books that I can read to improve on that?