Ms 15-16 - work your note accuracy here. Again, a slower tempo might help. Also, you should be using a comfortable fingering for the right hand - if you're not sure about one I have one that works smoothly, because this is an awkward spot with the wrong fingering.
Ms 84 - You really shouldn't clear the pedal at the end of this measure. Indeed, the orginal Durand edition does have this marking, however later research into the area shows that Ravel told his friend Perlemuter that he regarded this as an error - it makes more musical sense to hold the pedal and let the haze blend into the next measure, otherwise it sounds quite stark and is not consistent with the rest of the piece. Modern editions have corrected this error.
Well, nortti, if this is not your best playing, perhaps you would care to show us what is? I always enjoy a good interpretation of Ondine. (Do you play the other movements, as well?)
Ms 45 - the arpeggios in this measure are marked "very sweet" - you might check your fingerings here.