Hi Yan
Very nice photo of the girl - you caught a good moment, the selective focus works well and I like the framing!
The flower images are also all well composed. There is a good "feel" to them and I like the way you "see" the images - good eye!
Overall I like shallow depth of field for images that are a bit more on the artistic side of things, but still I agree with Dirt's suggestions regarding focus - this however doesn't mean that I'd like to loose the shallow depth of field here, this is more about fine tuning it to perfection.
Thanks for sharing these nice and fun images. I like them!
