Responses
#4 I think those are Yukimura and Shinonome from the Warui series. Here's a link to their first volume in the series: http://www.mangago.zone/read-manga/i_don_t_dislike_you/
#1 reminds me of this chapter of Bukiyou na Silent: http://www.mangago.zone/read-manga/bukiyou_na_silent/an/bukiyou-na-silent-chapter-Special.html
What manga is it?
1. https://s-media-cache-ec0.pinimg.com/736x/53/97/97/539797ceb53ce9453c94b7e802e1320a.jpg
2. http://data.whicdn.com/images/24558817/large.png
3. https://40.media.tumblr.com/d628e7ac1ed7a8a06967794dd980b4c8/tumblr_n85d4oA9KX1tfvua9o1_500.jpg
4. https://s-media-cache-ak0.pinimg.com/236x/3d/ee/5f/3dee5f5fb473a8fd1305621b46e08763.jpg