I agree with Smalls about the last shot.  I thought it was the best of the group.  I would have enjoyed the first shot more if you hadn't cut off the top of the young mans head.  It's too bad you didn't have an assistant to hold a diffuser to block some of the sun.  There are some specular highlights on the face of the young lady, and the lighting is a little hot in some areas. The diffuser would have evened out the light. 

I liked the hand holding shot.  I always have trouble getting ring shots on the hand. My only suggestion would be to crop it a little tighter, and maybe adjust the angle of the hands a little to show more of the fingers and less of the tips.  Still, you got the ring in there well.  Nice job!