The four dots at the bottom are the bird's feet. The original outline was 人人. This turned into four dots. Above these are the wings, right and left. Above these is the head. The head has an eye. The beak is on the top of the head. The kanji 鳥 is a picture of a bird.
In China there are wide open fields. These are marked off into squares to form paddies. There are many square paddies. Footpaths are running between them. A paddy is made up of many squares. Four of these were taken out. The kanji 田 is a picture of a paddy.
The kanji 月 is a crescent moon. The original form was that of a diagonal moon. The upper part is missing. The curved lines of this moon were made into straight lines. The whole thing was made vertical. This is the kanji 月. There are blurred spots on the moon. These blurs were also made into straight lines.
Japanese people's eyes are horizontal. If kanji had been invented in Japan, "eye" would have become 皿. But look at the picture of a Chinese person's face. The eyes are diagonal. These diagonal eyes became vertical in the kanji. The kanji 目 is vertical. In old Chinese paintings the eyes were diagonal.