I found that for me anything taller than the shortest (female) Elezen option ends up looking a bit odd or overly lanky.
The shortest option, on the other hand, is around the same as a female Highlander that is about 3/4th the way up the height bar. Still feels distinctly Elezen, but not as awkwardly proportioned (in my opinion). If you're mid-range or taller, I'd say try creating an alt at the shortest height and running around for a bit to see what you think.
If you are already the shortest you can be and don't like it, on the other hand, Miqo'te or Au Ra are your best choices if Highlander is off the table (which is a shame - I constantly debate with myself whether or not I want to switch the Highlander, as I really like them, but I also really like how this particular character looks as an Elezen, so I just keep putting the decision off).
