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Pretty good for a first try. You've got a difficult setting with the sun & shade. If you can go back here, I'd recommend trying it on a cloudy-bright day. Not quite gloomy, but overcast. Then you get rid of the wide range of light, & depending on the quality of the light, you may have nice saturated colours. And in lower light you can do longer exposures too. I also like to use a polarizer to enrich the colour of the rocks or surrounding vegetation.
If you do more waterfalls, also think about whether you want to show a wide scene, or maybe emphasize the height of it with a vertical shot. Look at both compositions before you click the shutter; perhaps one will strike you as the best orientation.
Have fun!