The first model has dynamical shape which has many-side. Due to the multiple sides, it enhances better grip and can stimulate more pressure. However, it takes much spaces and the head parts is comparatively smaller than other shape so that it can not scoop a lot of rice.
The second model is normally slim and has roundish big head. There is a blade at the head part so it can be used for chopping food and also the hole in the food helps to clean the slim vegetables and easy to hang on the wall.
The last model is a part of handle and this model will be the closest model with final product. One of the problems that this handle has is the size is too big to normal hand size. Therefore, it needs to be decreased and there should be strong connection between head part and handle.