We have investigated the drying of colloidal suspension drops deposited onto a flat substrate and the thickness of the resulting solid film. To explain the complex dynamics of the drop shape, we have developed two models based on simplified descriptions of the drop geometry during the drying. The first uses the assumption of a constant contact angle and the second the assumption of a constant contact base. The results have been compared to experimental measurements of the drop profile recorded at different times of drying. In particular, we find that the constant contact base model allows a good description of the final thickness of the deposited film under a large variety of experimental conditions