Bamboo split

I've kept the bamboo splits for a few years. They are too thin. It's hard to use them individually.

Today's ikebana lesson was about massing lines to form a surface. I thought it was a good practice for me to put these thin bamboo splits together. I used a simple weaving technique and made three parts, each with 10, 12 and 15 bamboo splits to give some variations. I sprayed them long time ago. Not quite an even spray. But the variegated tone suited better here. An even spray would be too strong.

I chose the container I made with the split top, so three groups of bamboo splits would easily be placed. When I was satisfied with the structure, I added a few honey suckle branches (from my front yard). Sensed I needed some focal point, I added some bouganvilla (also from my front yard. I really didn't spend extra for flowers and branches.)

I feel there's something missing at the base. It was a too clean cut between top and bottom parts, and the top part was heavy. The reason I post this study is hoping someone can give me some advice how to fix the problem.