Might I suggest that next time you try some or all of the following:
1. Bracket your shot. Try shooting one stop up and a stop down of where you were. Or if you're unsure of where you need to be for shooting a waterfall, try starting at 1 minute and working yourself all the way to 1/400. I find when doing a study such as that you really get to know how the water is moving.
2. Change your DOF. Try putting the grey hunk of concrete outside of the DOF. This would help remove the effect the lines are having.
3. Change your POV. Right now your POV is highly angled towards the waterfall. Perhaps rotating your POV so that the waterfall itself is in the lower left hand corner and the black water is more prevalent. This would cut down on the lines especially if the gray hunk of concrete wasn't smack center in the top area. You might also try lowering your POV so it's more horizontal to the top of the waterfall. This would push gray hunk of concrete off to the left middle quadrant of the photo and push the black water larger and to the top.
Just a couple of thoughts. Thanks for sharing your photo.
I find it interesting that 19 people have viewed this image and NOBODY has commented on it!! WOW!!
I personally find B/W photos of water a very hard study to do right. So that you for sharing. It always seems that there is something which can be improved on. Fortunately, waterfalls don't move! So we can take their photo over and over and over again. ;)
It's interesting that when we photograph water we tend to take it to two extremes. Either we freeze it, and it becomes a image of the water or we flow it, and it becomes an image of the flow.
In this photo it appears that we're someplace in the middle. We've got the classic freezing of the "Black Water", and the beginnings of a flow down below the falls. It is important to note that you were shooting fast enough to capture the water droplets in the air. While they're not in focus, they're also not the central object either.
Which leads me to an odd observation. If we look at the far bank of the dammed up river, it appears to be crystal clear and in focus. Yet if we look up close, at the lower rocks (Bottom Right and Bottom Left) we find that they're not in focus. This would lead me to doubt, the focus of the waterfall itself, if it weren't for the branch sticking straight up out of the falls which appears to be in focus. So I'll chalk it up to photo resolution issues and move on.
When I look at this image, I find that I can't focus on the waterfall for very long without my eyes, bouncing around between the grey hunk of the concrete dam, and the turbulent froth under the falls. It then doesn't seem to end up on the waterfall, but it ends up on the highly detailed grey hunk of the concrete dam. I'm not sure if this is the intent of the image; however, attention needs to be paid to the lines of the image.
We've essentially have four major lines in this image. The first and the second line are the top and bottom of the waterfall. Since they both follow a sloping angle towards each other, your eye naturally follows the slope. Next comes the third major line which angles from the lower left corner to the edge of the water fall. This redirects your eye slightly to the high contrast grey hunk of concrete. The fourth line is from the upper left hand corner back to the high contrast grey hunk of concrete Which is why when the eyes go wandering you end up back at the grey hunk of concrete.