I think this picture has the basic 'bones' for something very nice for all the obvious reasons.
Decent focus, sharpness, composition.
It tells a story totally without the title - no activity. man looking off in distance, calm water - all that stuff.
What does throw this off, for me at least, are the colors and brightness.
The red catches my eye and the brightness of the stone and fence seem out of place and disproportionate.
I would - in this order:
crop it to 2:3 to reinforce the horizontal lines of fence, legs, fishing rods and horizon. That doesn't lose anything important.
change it to b&w to remove the distracting colors (and adjust their individual brightness so the man leaps into concentration as the center more.
The solidity of the fence and the stillness of the man leaning against it becomes more important in B&W.
then vignette a tiny bit to close off the corners.
At first I thought that the picture would gain from a face profile but looking at it again, I think that the looking out over water thingie gives it a bit more mystery.
I think with a bit more work - perhaps even a bit of sepia tone to age it a bit - and this would be very nice to print and go on a wall.
(perhaps, the hat needs a bit of contrast so it doesn't look so flat in BW)
Very nicely seen and caught, I think.