Nice one emi!
In the future would you perhaps consider wedging a rock in at the base so that the roots look like they are leaning on it?...not so much ROR style, but just resting on it at the base. It may also provide the illusion of a more powerful trunk with increased taper at the bottom too? (just an idea?).
Perhaps you could also cut back the main straight leader and start to regrow a new one this growing season which could mimick a little more of the nice flowing movement that is already in the bottom of the trunk? (although it may be a hard decision being that you have developed all that ramification in the crown).
Is it a Chinese elm? if so I don't suppose it will be showing a bare winter image, so my last comment may not apply?
I like your elm emi, thanks for sharing and allowing a beginner such as myself the opportunity to comment.
Cheers, Dario.
