Based on the feedback, the model should make the following corrections to the 3D object:

1. Increase the height of the object to make it appear taller. Ensure that the increase in height does not compromise the rectangular prism shape of the object.
2. Adjust the width of the object to make it clearly narrow. Be careful not to alter the length of the object while making this adjustment. 
3. Ensure that the object's length is clearly depicted to remove any ambiguity about it being long. This could be achieved by making the length significantly greater than the width and height.