I am with Roland, that this is one to ask for more picures/better quality.
I looked at these yesterday and even thought, that maybe two birds might be envolved:
picture 1 and 3 seems a possible Yellowhammer to me as Roland said: head pattern with broad supercilium, widest behind eye in a triangular shape, pale spot on all dark ear-coverts and broad triangular malar stripe are good, as is yellow wash to face and belly(looked at this picture on two different screens). But as bill seems small and pointy in all pictures, and blackish straking to breast with unmarked belly is unusual for Yellowhammer but within variation.
Second picture with appearent very narrow straight supercilium of even wide gave this bird a Reed Bunting feeling to me (with bill shape and size better for this, but within variation for Yellwhammer) , but this might be due to alerted posture with flat, depressed crown in this single picture (representing the jizz of only a fraction of a second).
But: Roland is right, all these points can be explained by artefacts due to picture quality (as allways no offense!)
Conclusion: more pictures please, that might proof that this is indeed a Yellowhammer (thats the species I would say it is, if I had to put a name on this bird). But I still have the feeling that I digged out to much in these pictures.