RichieTwitchy
YNWA
No it's not.Good thought. TBH 'photographic artefact' is an oft repeated myth.
But back to OP and the bird in question - (as others have said) location where other birders have snapped photos of a CS, bill colour (I've taken it into Lightroom and the colour doesn't vary) and its overall shape (though pixelated and poor) would seem to indicate CS.
But pop back down today (if possible) and take a good pair of bincoluars with you this time as that should clear it up once and for all (for yourself).