Switch gmail back to old interface (and review the new features, too)a

 at least for now... hopefully, they will continue to improve it before Google pushes it out as mandatory,  but hey what do the users know? The "new" blogger interface still kind of sucks (tho it does have some enhanced design features).

Click>Compose 
At the bottom of the compose screen> click on More Options.

Choose Temporarily switch back to old compose

Learn more (Take a tour):
 https://mail.google.com/mail/?shva=1#inbox?compose=new

Review Changes:
https://support.google.com/mail/answer/2645922?p=newcompose&hl=en&rd=1 

5 reasons to love or hate it (my big hate - small email canvas! but then I don't do much email via gmail as mobile, either) 
http://www.informationweek.com/software/productivity-applications/gmails-new-compose-5-pros-and-cons/240152001