The_Traveler's notes aside ... here is come C&C on composition.
#1 is very flattering to the female, with exception to the weed growing out of her head and the "man hand" effect of her right hand.
#2 Might need a closer crop - find the fencing fore and aft distracting.
#3 is a cute snapshot
#4 was well thought out. Would have rather seen that rail lead into the image then out of it. Some apparent distortion with the males hand/forearm closest to the lens - cropping it tighter on the couple may work.
#5 I get what you were going for - but we are looking up there noses and her right arm isn't very flattering.
Enough said about the light. The B&W ones compensate for that and made a nice change.
I like the heart idea but take a bucket with you and you can then scoop some water, splash it on the sand to get rid of old footsteps. Clean sand works best for these shots.
I really like the pose in the first shot. Next time try to show more of her arm if it is draped over or behind a back. You want to avoid the appearance of a hand growing out of a shoulder.
Overall, a few changes next time and you'll be doing great!