A couple of questions I find helpful to ask myself before posting/sharing:
1. Has this subject been "done" before? (Almost everything has, so go to #2)
If "no", then GO FOR IT!
If "yes", then:
2. Have I done something different to make my portrayal of the subject different or unique?
If "yes", then: GO FOR IT!
If "no", then:
3. Does the photo I'm sharing represent my best use of the photographic aesthetic, technique and process including lighting, perspective (choice of lens), angle of view (position), composition, time-of-day, (not to mention, focus, exposure, exp. compensation, shutter speed, aperture, etc.). In other words, this is my absolute best work; I could not conceive of improving on this photograph!
If "yes", then: GO FOR IT
If "no", then: don't post.
There is a fourth question... Might I learn something valuable from posting/sharing?
If "yes", then: GO FOR IT (but only if you're open to learning; you are, some aren't).
If "no", then: don't post.
Frankly, the photo you posted has many flaws: flat light, harsh light, burnt-out highlights, little tonal depth, too "straight-on", no flow through the scene (despite it being of moving water).
I know this comes across rather harshly, but... you asked. Don't hate me for it.