Wow, that twin hackberry is stunning! Great job with that. Really like the chojubai as well.
I go back and forth regarding the 4th trunk on the hornbeam group. I have no issue with the number 4 or the appearance of 4 trunks, but I do think it looks better without for a couple of reasons - (1) it makes the composition more asymmetrical and interesting, and (2) that small trunk just looks weak/undeveloped compared to the others. Maybe with time that could change and it could be more effective as part of the group. I think if you do remove it, the group might benefit if there is a way to lower some of the branching on the right side just a bit.
The beauty berry works with either pot, the contrast of the first is nice but the second seems to echo the berry color nicely. I don't think you can go wrong either way.
Nice photography too