
As doom used photography for much of its sprites, it makes sense to use 3d objects texture mapped for a similar style & for easier and better control lighting and animations for sprites.
of course you guys already know this, but i say to show this barrel at different resolutions...
doom_rusty_barrel_regular https://archive.org/download/images_sam ... el_reg.jpg
doom_rusty_barrel_atmospheric https://archive.org/download/images_sam ... _atmos.jpg
doom_rusty_barrel_regular low-res 1 https://archive.org/download/images_sam ... ow1%29.jpg
doom_rusty_barrel_regular low-res 1 https://archive.org/download/images_sam ... ow2%29.jpg
doom_rusty_barrel_atmospheric low-res 1 https://archive.org/download/images_sam ... ow1%29.jpg
doom_rusty_barrel_atmospheric low-res 2 https://archive.org/download/images_sam ... ow2%29.jpg
the texture is a free texture from http://texturify.com which i modified & made seamless for cylindrical mapping, although if you zoom in you can see the join is not yet perfect.
for a doom sprite would need to render the images using Orthographic projection / viewport, so that edges etc stay straight etc.