Unless I'm mistaken there seems to be the same issue with the tip of the starboard wing too. While the first render appears mostly shades of blue, the artifacts in the following renders appear to be the same blue. Could this be a lighting problem? Without any textures at all, what does the model look like?

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All the Woes of a World by Jonathan Icknield aka The Bryster

And in my final hours - I would cling rather to the tattooed hand of kindness - than the unblemished hand of hate...