I think it's better to take a lot of time on details 'speically when it come to armour. It took me three months to make the ugly picture of two knights. Oh man. Besides that, he is coming a long very very well. Keep up the great work.
Yeah, My patience dies after like 5 minutes. You could always put it down, work on a chibi or something simple and then come back when you think your ready. That's what I do, or just go watch TV and say "f it.".