Beautiful work! I've done a bit of modeling/texturing for the Doom3 engine... it's fun, but not as easy as you make it look! This is lovely stuff, is it in-engine or a beauty render (I'm guessing 'beauty').
Thank you! It is a bit of a beauty render I suppose (I'm not sure about the exact definition). I rendered it in Marmoset Toolbag (which is a real-time engine) and then brought the renders into Photoshop to assemble them and add some subtle glow around them.
In-Engine is an unmodified screenshot of the actual game assets taken from the actual game engine running in real time. Beauty Render is pretty much anything else, although it generally means a render from the 3D modeling software of the unexported original mesh and textures the game asset is compiled from.
In this case, because it's from Marmoset and includes post work, I'd personally call it a Beauty Render, but some people consider the Toolbag to be a real-time engine (which honestly is mostly is, even if nobody really makes full games in it), and might call it in-engine, but it's been edited (in PShop?). If you dropped the clock into Doom 3 and took a screencap, it'd look subtly different, and then it'd definitely be In-Engine.