Re: 120 x 55 x 55cm 'On the sea shore'
If you have seen the 120 Gal I have been doing for god.....a while now....I ask these same questions of myself and move and play around like lego building blocks in search of a nice color and plant scheme contrast.
This is teaching me a great deal.
1. How to work with different species and contrast together.
2. How each species is able to grow and how the best method of trimming applies(eg, not just ADA style, or just Dutch style)
3. The wood is similar to stone but with more forms from rock like Burls, to smaller thin wisp of branches.
4. the Sense of depth and thickly planted groupings.
However, this is not nature style. I have a feeling that is more your direction, but you can still use some of these ideas above to approach nature style, in other words, these approaches are universal regardless of style.
You take risk and try different things. Don't like em? Easy to change them back, just take your time and give them a few days to think and ponder what looks right, best for you.
I find many of the ideas I had, were frankly, terrible. But that is how we learn, we try and make mistakes, and then learn from them. Think of all the mistakes Amano has made over the years.
Tenacity keeps us going. Tenacity triumphs over $, skill, intelligence etc.