In order to be able to shape a blank that was collected as a yamadori or comes from a tree nursery into a bonsai, it is essential to carry out a thorough tree analysis. Of course, you have already checked the characteristics of the blank as a future bonsai before you collected or bought it. The first preliminary analysis is usually based on the trunk movement and branching; if you take a little more time, you will also look at the roots. The pre-selection of the raw plant is a very important factor and you should really take the time to check the selected plant for its suitability for bonsai.
Important criteria for a later bonsai design are conditions on the plant that are difficult or impossible to change.
The root base: is an important focal point for the later design, it should also match the trunk movement.
The movement of the trunk: A moving trunk gives the subsequent design more character than a straight trunk.
The branches and branch distribution: Not so important for deciduous trees, but not unimportant for conifers.