I think you have the makings of a great image. You have a beautiful subject, and her pose is nice. However… The left side of the image is somewhat blown, and doesn’t help us appreciate the subject. If the goal was to show her in the context of a location, then this too, unfortunately didn’t happen. A portrait orientation would be more appropriate for this shot. The light falling on your subject is primarily from behind your subject, to her right, and a secondary source from her left. Unfortunately the light from in front of her face is limited, resulting in shadows. A reflector or a fill flash would have filled in some of the shadows (not too much however, or you get a flat look). While The shutter speed is a bit low and the depth-of-field is somewhat shallow, these are not the reason why the image is soft. It is clear that you were shooting in the shade and therefore had low light. You were shooting at a focal length of 30mm, and at an approx. distance of 4 feet. At those values, your depth of field is about 5 inches in the front and six inches in the back of the focus point. So had your focus been exactly on her eyes, her face would have been fully in focus – however it is soft, so I’m thinking your focus was actually short. Were you focusing manually, or did you let the camera do the autofocus?
If you were to retake this shot, consider using the flash as fill-in, with a FEC (flash exposure compensation) of -2 to keep it at fill only, or use a reflector to bounce some light to the front of her face. You should try focusing manually, with the primary focus being on her eyes. Change your orientation to portrait, and perhaps align her a bit to left of center of the image (then her head “leans” into the image). The shutter speed of 1/25 is at the lower limit of hand-held without camera shake, so perhaps putting the camera on a tripod will give you more steadiness and composing capability. Oh, and tell her she’s beautiful.