Julian, hey, thank you very much for the time you took to reply. I'm definitely in well over my head uploading to JP, I'm not a professional photographer - very much a limited novice, but familiar with concepts. I fall squarely into the category of just wanting to provide pictures for aircraft missing from FR24.

The most major hurdle I'll face is not having a Adobe CC subscription - so no fancy photo editing software here. The above was straight from my mobile phone (taken very very quickly as I piled back into my aircraft to take the ferry pilot home), and a simple pass through Paint.NET (yeah yeah, I should at least use something more capable like the gimp) to scale it down to the maximum resolution for upload. I suspect that's where the compression artifacts have come from. Understood on all of the other comments, I'll have a go again in future when I'll have more time to spend trying to get things composed correctly. This one is definitely beyond saving ...