Duke Gardens

[Thursday]

I went to Duke Gardens today, my first time out actually just shooting. Please give all the criticism you can, I don't care how harsh it is. For some reason I just feel like i'm not getting the sharpness I should with this lens(sigma 24-70ex). Pictures were mostly out of the camera little to no pp except resize.
http://farm4.static.flickr.com/3072/2665308465_12eeae33a8_b.jpg
200
56mm
F/2.8
1/1250

http://farm4.static.flickr.com/3012/2666142936_a0d9e493f1_b.jpg
200
48mm
f/ 2.8
1/1600