Hi,
The number 1 suggestion is to select a more imaginative or descriptive title, such as; "Help with improving my aquascape". That way, folks weary from browsing endless threads and who only view threads of interest might click on your thread to see what's going on.
Apart from that bit of human factors engineering, the next suggestion would be to reconsider the geometry or application of your sloping gravel. The fact that you have a deeper level on the right side, and which would ordinarily be of geometric interest, is negated by the haphazard placement of the plants. Having a short depth on a side suggests the opening up from a heavily forested area to a glade or lawn. So this means that your taller plants would add more balance to the scape by being on the deeper gravel side, and then the shorter and smaller plants would transition going to the left. That would compliment and preserve the triangular shape created by your right-to-left gravel profile. Also the gravel line itself should be straight instead of wavy so that you form a perfect hypotenuse of the triangle.
That goes equally for the wood pieces. Their lean and angularity would best compliment the triangle shape by having them both lean right to left cohesively instead of at opposing angles. You could have one further in the background. Perhaps the smaller one could be place leaning left and placed more to the left to support the triangle theme.
It also appears that you have distributed specimens of the same (or similar) type in different locations. Consider having them together in a grove for a more powerful focus - and for heavens sake trim them to the same height so that they do not look like an unfinished jigsaw puzzle. Similarly, the two groups of hydrocotle could be placed surrounding one of the wooden pieces (and even extend under the lean of the wood) and then another grove of something else can adorn the other wood piece.
The equipment is also very annoying. We do not need to see the heater. Could it be oriented horizontally and much lower down near the gravel? Perhaps even have the head place at a corner so we don't have to see the cable. And speaking of cables, what's the deal with those two black cables in the front of the tank? This is is considered to be very bad Juju.
OK, next is that thermometer. In Western civilizations adults read books from left to right. That means when we look at anything, the pattern of how our brains scan the scene is as if we were reading a book - from left to right. That therefore means the first thing I notice in your scape is that unbelievably annoying thermometer, which ruins the mood, especially since the gravel is narrow on that side. The triangle apex is pointing directly at the thermometer. A much better placement for thermometers (assuming there is a local council rule that it must be mounted on the front glass) would be on the upper right corner, because that will be the last place in the scene that my brain will scan, so it will be much less annoying.
Additionally, having a powerhead mounted in such a prominent location is extremely uncool. Consider moving it to a less irritating place, like on the back wall up high near the water level pointing forward so that is fades out of view. This will also give you better water flow/distribution.
So there you have it. A few ideas to explore. I'm sure it can be improved substantially if you implement some of these ideas, especially as regards hardware placement. Immediate dividends to be had there I reckon.
Cheers,