Certainly a stunning mosaic.
The main issue I see here isn't really your fault. Isn't correctable either without re-shooting. It's a symptom of compact cameras as opposed to SLRs. But the centre line is a tiny bit out. Yeah a tiny bit but that bit makes a lot of difference in my opinion.
What might have been nice is something contrastingly soft in the image. Something that also added scale.
Great effort though.