good pic, but as you recognize it has some issues. first get rid of the glare's. By that I mean the unshaded parts where it should be shaded. Most noticable part is where he leans on thta pillow thingy, the border isnt shaded and looks like its glowing.
try to shade more consistently. some areas are very dark while others arent. especially the wooden board in the front looks messy. You can try to add shadings on a different layer using a soft brush with very low pacity (15% max) and low flow (maybe 27%). As long as you hold on to your mouse button you can fill it up equally. as soon as you release and go over a covered spot again it will darken hard.
You can also add a layer, hold the alt key and press the add layer button buttom right. set mode to overlay and fill with neutral. You can now shade on this layer using either brush tools black/ white or burn and dodge tool. play around with the settings of the opacity, flow and exposure. NEVER 100%
your light source is very clear and pretty frontal, this means that you can shade hardcore and it wont mess up the picture, this is a good thing. dont be afraid to shade (something I have to tell myself quite often). but in any case keep it fluent and not messy.
about the face: just shade it! behind his ear. Also i think it would be better if you add some ground shade of the "fence" since that would create a shade on the ground.
I think the boat is just fine, if you think its to sharp just blur it a bit at 5-10%
although I am not sure I think the horizon is to high. concerning the POV I think it should be lowered, but its a minor issue
your waves are problematic; the highlights are oke, but they are to dark and to me look like little islands. also they seem scattered to irreguraly and a sea doent really look that way.
one more tip on shading. If you have your linework done you can select and area for example one fence pole and then shade in that selection. That way you cant get out of bounds.
all in all not a bad picture, I like the perspective and the setting.
