Since you asked, here is what I would advise. Probably not much you can do for August, but in the future.
1. I don't do figurines, but I know you do, so assuming you want to keep them as part of your composition, I will work around them staying where they are. The mossed steps leading to them is very good.
2. The pot is constricting. It should be wider by 50%, and oval or even on a slab.
3. Forest compositions require the composer to use forced perspective for the composition to be believable. The left and back work for me, but to have the main tree front and center kills the perspective. I'm forced to look around it, rather than into it. Moving it to the right by a few inches invites my eye into the composition.
4. You definitely need the larger tree, because many others are thin and similarly-sized.
5. The tree in the front-right is awkward. I'd remove it.
6. The light-colored rocks at the front left are visually distracting, I would moss the area instead.
7. When it has finished growing the first flush, trim the entire canopy as one unit to give it a rounded, pleasing silhouette. Then stand back and look for dense areas, and remove individual leaves to balance it out. Usually, I end up cutting off the leaf I want to keep, so I deliberately grab the leaf that stands out to me, and cut off it's mate. Maybe it's just me, but it seems to work.
8. Bonsai is all about creating an illusion. The green trunk of J. Maples belie the trees' youth. If you want to even the tones, paint the trunks with lime-sulfur, diluted to 1/2 strength with water. It will also help with adding some quiet and subtle consistency in a composition that has lots of different colors and textures going on.
9. Moss the whole surface. The whole thing is the composition, so you don't want to "jarr" the viewer peering into the monks back into reality with a shot of the bonsai soil. Continue the scene all the way to the rim of the pot, which becomes the frame.
10. I would keep the fallen tree on the left, but don't overdo it. One is good, more takes away the novelty.
11. If you do keep the front right tree, clean up the apex, the cut is prevalent and distracting.
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