Looks great! Can't really tell from looking, but if it has aged it should be fine. I don't know off hand how long is recommended, but just wanted to caution you about chicken poo because it is high in urea that can burn plants (like fertilizer burn) when its too fresh.
Leaves from deciduous trees decompose quickly, especially if they're mulched up, so those don't concern me much- they quickly draw lots of earthworms that turn them to black gold
The only problem I've ever had was from wood chips. They take a long time to decompose and the microbes that do the job use a lot of the available nitrogen. I saw yellowing leaves that signaled the problem and I compensated with additional fertilizer. The following year it had decomposed and everything was lush without additional fertilizer.