Add another highlight: in new layer, with white soft brush (B), add a dot, then transform it (Ctrl-T) as shown here,...
then set its blend mode to... you guessed it, Overlay!, opacity to 30-40%, and again, Ctrl-Shift-G (Create clipping mask)
Add another highlight...
...set blend mode to overlay...
then let's make another nice reflection. Create new document (square, about 200x200 px), with transparent background, switch to Shape tool (U), choose Polygon, set sides=4, then open Options,
check Star, and
set Indent sizes to about 85%. With these options, add a star near top-left edge
Rasterize the layer (Layer menu - Rasterize - Shape), then go to Filters - Distort - Spherize - apply about 50-60% effect. Repeat if needed.
Now copy-paste the star, transform it as needed (scale down and rotate), then set its blend mode to overlay.
Another nice highlight: return to the original shape layer with water drop, duplicate it (Ctrl-J), bring copied layer forward in layers palette (make sure that all clipped layers remain clipped). Then change its color to white and scale down a bit (Ctrl-T).