This work investigates the morphological evolution of viscous fingers formed during the Saffman-Taylor instability, which occurs when a less viscous fluid displaces a more viscous one in a porous medium. Using numerical data obtained from the vortexsheet method applied to a Hele-Shaw cell in radial flow, we analyze the physical mechanisms that govern the growth and shape of the fingers, as well as the effects of the dimensionless parameters that control the instability. The study focuses particularly on the viscosity contrast and the effective surface tension, using as a reference the article Similarity characteristics in the morphology of radial viscous fingers, published in the Physics of Fluids, of which I am a coauthor (OLIVEIRA et al., 2023). Based on this framework, we investigate how these parameters influence the number, length, amplitude, and stability of interfacial structures over time. The understanding of these patterns is particularly relevant for industrial applications, such as enhanced oil recovery (EOR) processes, in which the instability reduces sweep efficiency. The results obtained reinforce that the interaction among viscosity, surface tension, and pressure gradient determines distinct morphological regimes and provides important insights for modeling, controlling, and reducing instability in real applications.