To get the sheep to the other side you have to start by opening the flowers or you will not be able to move at all.
Make rows that touch as many flowers as you can for quickness and less moves used.
Once you have room to move again, get the sheep as close to the logs as you can, so that as soon as you have the crops ready to take the sheep across you are in the right place.
Make crops fall more than once for you and you will get added points on the crops meaning you won't need to gather so many.
Make as many combinations and longer rows as you can.