Off to a good start. Here are two things that I've noticed. First off, you are shooting in Adobe RGB which can't be displayed on the web. You may notice a difference from how the colors look in PS on your comp, but they will be much less vibrant via web. Change your camera to shoot in sRGB. Also, shutter speed doesn't have anything to do with DOF, your aperture does. The zoa was shot at F/4 which can be pretty shallow. I try and shoot between F/8 and F/16 depending on the desired DOF. Since you were already at ISO 1600, I would really try and get a tripod so you can lower that and slow the shutter speed down. I also hold the lens directly to the glass without a tripod for up to one second if I have to, sometimes I'm just too lazy to get the tripod out.