Based on the answers provided, the following corrections need to be made to the 3D object:

1. Modify the position of the smaller rectangle (horizontal part of the T-shape) such that it is connected closer to the top of the long rectangle (vertical part of the T-shape). This will make the object resemble a T-shape more accurately.
2. Ensure that the length of the horizontal rectangle is approximately 1/4 of the length of the vertical rectangle. This proportion should be clear and noticeable to make the object resemble a T-shape more accurately.