Hi Jill, and welcome to CiC.
For your first try you have done very well. I have no problems with the 'silky' water look and do a few myself.
Some ideas if you have another go;
a) Try to get a decent amount of rock, preferably with some of it's surface that is dry in the foreground area at least to one side. Careful because this can mean getting low and close.
b) Use a smaller aperture to get greater DOFf and ensure sharpness throughout.
c) Take the opportunity to take a few at different speeds whilst you have the chance.
Oh, and lastly post at a larger size (1200 to 1400px wide) so we can appreciate this good pic more
Grahame