I like it, I wouldn’t switch mediums, but develop as an artist in the medium you love best, maybe next time, use a flattening fluid/medium (added to the paint) to smooth out/remove brush strokes and glare, you will be fighting light reflections thus breaking up your blocks of color you aren’t intending. A flat varnish will help a little too perhaps (or wax).
The line of the shore hitting the neck distracts my eye, it has a guillotine effect! There is alot going on in that front of the neck and chin area (I might pop the chin). I’d like to see the shoreline and sky dropped down maybe? The light value of the shore might be distracting splitting your canvas. You could tone it down. Perhaps play with it in photoshop or GIMP (a free photoshop like program you can download) and see how it effects it before you commit. Remember lights near the front in full sun should be brighter or higher value then lights in the distance (at least in places). Even if it doesn’t seem that way in reality it probably is.