Not to diss Dominic Sherwood, but Jamie Campbell-Bower will always be the better Jace in my eyes. He just fits the character description better, and I'm already attached to him as Jace.
‘Shadowhunters’ has found its Jace Wayland: Dominic Sherwood! Are you excited to see him take on the beloved Mortal Instruments character? Read more about the TV series on The IF List http://blog.iflist.com/2015/04/20/shadowhunters-has-found-its-jace-dominic-sherwood/