I coloured the tree using the paint bucket tool and did the shadding by using the brush tool. Then I place it ontop of the tree trunk. Before that, I copy a lot of tree trunk and resize them and put behind. The small arrow I drew it myself and place them inside the ring.
Same goes with the cloud behind, using the brush tool. Then I drew tree trunk(from what i know it was called. sorry if i mistaken it.) using the oval tool, pen tool and spial tool.