So many things to adjust.. So many things to improve..
Okay, let's start from the beginning, shall we.
First of all, make the font look smooth, don't make it look harsh, that is what it currently does.
Don't overdo the text with effects, as a nice black or white typeface would look very great on it too.
Secondly, the background, it is very messy and doesn't make any sence whatsoever.
It's about RuneScape, pick a RuneScape background! Make an image of an area or so and just throw a nice color correction over it, that'd do, for sure.
Thirdly, get those NPC's out a bit more, they're not blending in with the signature at this moment.. You should definitely try to make them stand out more.
Hope this has been usefull to you!