CAPTAIN REX!
I realised that I'd never drawn a clone trooper before, so this happened

Not really a huge fan of the Clone Wars series, but I thought I should branch out and try drawing characters other than Mandalorians every so often! I do love the kit the clones wear

Around 7 hours, with 6H - 6B pencils, tortillon and a putty rubber.
All credit for the costume in the reference photo goes to the ridiculously talented OrtharRrith of The Dented Helmet forums. The image I used for reference can be found here:
[link]Thanks for looking

I would recommend you charcoals, they're really faster and less messy! I mean, your picture is not messy, but I know how hard is it to stay away from graphite mess