Hi Dinah, not using a tripod doesn't always mean your images are not going to be sharp. Looking at your EXIF data you are using an aperture of f4.5, shutter speed of 1/160 a focal length of 180mm and an ISO value of 200.
The wide aperture is going to give you a shallow depth of field, making your focussing critical, try f8 this will give you some depth.
At 180mm you should be using a shutter speed of at least 1/300, the faster speed will reduce the effect of camera shake. To workout the shutter speed when hand holding a camera click on this link
Finally increase your ISO setting to achieve changes to both of the above.
And don't forget to use the unsharp mask to sharpen the image.
Hope this helps.