A Mosasaurus modelled, sculpted and textured all in Blender from start to finish. I first modelled a base mesh with basic polygonal modelling and then sculpted with the multi-res modifier and then baked the normals. It took about 5-6 hours to complete. The model works both in EEVEE and cycles . If there is anything wrong you can tell me and I will try to fix it. Anyway have a nice day!