Good advice from Kiki there. Some additional notes from me:I would try to get down lower with the camera if I were you.
Go back out there and get lower so your eye level and take a few of this exact bird so you can compare the differences.
First image is nicely in focus but you've clipped the front and back. You can probably crop the whole thing down to focus more on the head and get a nice result from it. Light is decent for being taken under shade. Coloring is good, not too blown out or muddy.
The second image you are back-focused. The sharpest point of focus is her back, instead of her face. The composition is better, you have the whole bird in frame this time, but because her head's out of focus it throws the whole shot off. Again, you could crop out the birds in the background and get a nice vertical shot out of this kind of image with the focus properly adjusted.
Chickens move so erratically and quick it can be hard to capture them with a cell camera (or other point and shoot type camera) sometimes due to the shutter delay between when you "click it" and when the image is actually taken. You can get around this by taking several of the same image and delete the ones that aren't the "best of the batch". Increases your odds of your flock not foiling you (or wind with flowers, which happens a LOT).

