Eurasian blue tit (Cyanistes caeruleus)
Even though Eurasian blue tit is kinda common bird, I've been waiting for this one to visit my hide for 6 months. It's been there only twice during the season and I managed to take this photo on the second visit. Bird was there for less than 5 minutes. The wait was worth it :D.
Sony A6600, Sigma 150-600C @546mm, ISO800, 1/250s. Postprocessing in Darktable and GIMP.