I’ve walked past this mural for years, and they re-do it every so often. The primary change from visit to visit is the color palette, but over time, major compositional elements change as well. I’m showing the previous version (circa 2013) and now both in black and white just to keep the comparison visually fair.
The bird’s head on the right is a mosaic, originally including mirror fragments, now painted. I think the fisheye treatment in the first image works well because the mural already has a bit of a fisheye perspective to begin with.