overall colouration, colouration pattern and jizz looks good for a female Red-Footed Falcon. The right orange body, white contrasting cheeks, the right grey colour to upperparts. If the choice is between Kestrel, RFF, Merlin, Hobby and Peregrine, I think this can be identified as a RFF with a high degree of certainty. Adding a shape, that looks good for RFF: compact, short tailed with long, but still broad wings.
Caveat: I would like to learn, if a 1cy RFF with the warmest underparts within variation can be excluded here. Because I think, appearant lack of streaked breast/belly can be result of low resolution (as allways no offense). But then orangey underwing-coverts must be explained by warm light condtions, which I think wouldnt produce such "perfect" female type orange underwing-coverts.
If your bird isnt a RFF, than light conditions and artefacts would produce a pitfall picture here, that seems hardly believable to me.
From my experience and literature, RFF are at least regular in Poland (and NE-Germany). They even can occur in small (rare large) flocks in "influx years". I have seen some during migration in NE-Germany.
Assuming, this wasnt taken recently? A RFF in late november outside normal migration period in Poland would be a good record, I think?
Yes, regular and less scarce than in the UK - I remember seeing them much more regularly 20 years ago in the UK but they have very much declined as a species everywhere. I suppose a late breeder could account for aNovember record in Eastern Europe/Poland ? but, it would be a good record nonetheless.