Critique for university work


For my one of my modules at university i have chosen to model a few different assets from modelling through to rendering.

Here is a Colt Python 357 Magnum that i have taken through these stages, i feel like it is at a good level where it is now, but if anyone could offer any advice on what i could do to improve this, it would be much appreciated.
I shall be adding the gold screw that is in the handle as well, as it would hopefully make the handle more appealing and less flat