I've noticed there is not a single one of these for a while, and I figured that such a thread might be useful. If not well, these still needed to be brought up.
http://danbooru.donmai.us/artist/show/12175 satsuki_(dorowa) -> koukawa_satsuki, or if that is incorrect (not 100% sure) to what 江河サツキ is most accurate as.
http://danbooru.donmai.us/artist/show?name=hitsuji to -> takanashi_akihito as outlined by the artist here http://cgi18.plala.or.jp/hituji. Alternatively this could be takanashi_hitsuji. The identification of 高梨_ひつじ as here http://www4.plala.or.jp/hituji/information.html is relevant.
My apologies if these are not specific enough, but I've tried to the best I can to make it simple.
edit. Okay, my mistake. Edited title to reflect that.
Updated by jxh2154