Well I tend to stay away from using loads of brushes, i just get confused and lose focus, it's pretty scary when i hit right click and 400,000 brushes appear I just don't know which one to pick! So for this i only uuuuuused *stares at the picture* pretty much the standard round brushes and chalk brush zoomed into crazy% and detailed the shit out of it. Then get a speckle brush to smudge them all together so it looks smooth. But yeah for the textures on the chest plate and the carbon fiber looking stuff between the plates i use [link] that place is amazing, it saves so much time! Hope that answered your question dude.
Thanks man, Unfortunately yes i did, especially in this [link] section! My worst habit, by a mile is going "meh, that'll do" or even worse "pfft, nobody's going to notice that....." Even taking that screenshot to show you the detail theirs like 50 things i could/should improve!! However I'll have him, bane and the joker immaculate by the time they go on the poster.