Using a sample of Active Galactic Nuclei (AGN), we investigated the relationship between host galaxy and black hole mass using the Sérsic index. We performed two-dimensional (2-D) decompositions of high-resolution Hubble Space Telescope images of (AGN) using GALFIT 3 beta. Taking independent mass estimates for a subsample of the selected galaxies, we test both linear and quadratic regressions in order to find an optimal relation for estimating black hole mass in other galaxies. Our results show that there was little difference between the linear and higher order fits. We examine the effects of these analysis techniques on the black hole mass to luminosity relationship. Application of the data was also looked at concerning properties of pseudo- and classical bulges.