You can find the original Japanese text with pictures at this Chado Nyumon.

How to Bow

Sitting Bow

Press both hands (against the floor) in the shape of 八(8).This time, women have both hands about 7 to 8 centimeters apart. Men have them no more than 20 centimeters apart. Don’t just lower your head, you should lower forward your whole body. Bow naturally at about a 30 degree angle.

Arrange both hands’ fingertips.
As for bowing, there are three kinds of bowing, “formal”, “semi-formal”, and “informal”.
For the formal bow, quietly put down both hands before your knees. As you lower the hands, deepen (into a bow) the upper half of your body forward naturally, fixing your whole palm against the tatami mat. Keeping your back straight and sort of fixing your abdomen to your knees, bend you upper body forward. Do this during the admiring of the scroll, the communal bow between host and guests, and when as guest you partake of the tea.
For the semi-formal bow, straightening your back, bend the upper body forward. Lower and fix your fingertips up to the second joint before (yourself) on the tatami. Do this when greeting your fellow guests.
For the informal bow, fix the fingertips on the tatami before your knees. Lower the upper body slightly forward. Do this as host when in the middle of a temae.

Both hands meet slightly, so that the left hand is in the front. Fix the fingertips lightly to the tatami. Straightening the back, lower the head carefully.

Both hands meet with the left hand in front, the fingernail of the index finger overlaping (the other). Fix the palms of the hands on the tatami and slowly lowever the upper body.
The most important thing is to bear in mind that when raising the head, you do not raise it too quickly or too early so that you do not seem thoughtless. Even compared to when you lower (the head), raise (the head) with a slow feeling. If you are sure to do this, you will naturally give a courteous impression.