Nice you might try pulling some detail out of the dark jacket and lighten up the skin under her eyes on 1 and a touch of dodging on her face on number 3
flickr does an auto-sharpen during the uploading process. If you're uploading small-res files, like 800 to 1000 pixels wide or long, the sharpening will make your pics look bad, over-sharpened. If they are high-res images, it doesn't really impact it that much.
