1- looks a tad blurry until you hit the brown building in the mid-left. May be underexposed.
2- I also think its underexposed, but with any higher exposure, your left would have been blown out (as it almost is). With water, try to get it either quick enough to stop it completley or do an at least 3 second exposure to get a good misty look to the water, not inbetween as youve done here (camera in full auto I presume?)
3- also looks a tad soft and maybe a little overexposed. I can kind of see what you were going for though.
GIMP wont do RAW, and i hate it for that. I love the software, it would be soo much better if it transferred RAW. RAW doesnt automatically make your images better. RAW gives you more ways to edit your photos to get what you really want out of them (if I understand correctly). RAW photos themselves usually look dim and dreary compared to what they look like after a good JAW-JPG conversion and edit, actually. RAW is always better if you know what youre doing with it, but as with DSLRs in general, if you dont know whaqt youre doing with it, its just as bad, if not worse than having a crappy P&S. Same principle applies to shooting in RAW. If you dont know what youre doing with RAW, it could potentially be worse than shooting in JPG.
Mark