Looks pretty good! In reality[1] the "CRT effect" isn't quite so intense, but I think that's just down to settings. This definitely has the right glowy and slightly-fuzzy feel to it.
> In reality[1] the "CRT effect" isn't quite so intense
By CRT do you mean the "lensing" of non-flat CRT screens or something else? The Wyse 55 is a fairly modern display (it was released after 1988 since it follows the 150 though not sure exactly when), earlier models had more (late 70s to early 80s) had more curvature (and lensing)
[1] My Wyse-55: http://i.imgur.com/7x2JdmV.jpg