Minecraft – get sheep to eat faster in Minecraft Pocket Edition

You are on Peaceful. Load your save, open the Pause menu, choose Options and from the first screen that appears (the Game options menu) slide the Difficulty slider all the way to the right.

There is no longer a "Peaceful mode" control, but there is still Peaceful mode. It is activated by setting the difficulty slider to the left. The difficulty slider now has only two settings: left and right, with no middle setting. Left is Peaceful, right is normal difficulty.

For the textures, you can easily change it by changing the terrain.png file with your desired texture pack. But beware that PC's terrain.png may vary with PE's. Try searching for a similar or exact texture on the Minecraft Forums. They have lots of ported texture pack.

For maps, you will need to first port it because MCPE maps aren't infinite and a portion of the world will need to be cut, pasted and then saved in MCPE format. Then you can transfer it to your Android device.

Note: My previous answer was for iOS devices. I have changed my answer to fit the question and hope it helps.