+2 on the watermark. Just resample them to 72dpi and put your name in a corner that will discourage anyone from attempting to print them. If you find someone wants one bad enough for their website they'll take it, if you ever find out and you can kindly let them know to remove it, not the end of the world.
Regarding critque, they're nice travel photos...
- on the landscapes fix the tilted horizons
- if you're going to include a boat, etc... don't place it right at the edge of the frame
- on the boy, the pose and expression is nice, relaxed and natural.
- the highlights are blown out on his face and clothes. Next time meter on the bright part of the face and use some fill flash to properly expose the rest (hopefully you camera has a spot meter)
- crop tighter to him
- the background is a little busy
- black and white conversion might work with the right settings (i.e. blue or green filter possibly)
- all images could use some curves/contrast adjustment
(edit: I'm on laptop and monitor is not the best, so this might be invalid)
Not sure what processing software you have but most of this should be easily accomplished in any of the popular apps. Looks like you had a nice time in Fiji
