its ok. some tips you might need to know --
1. its important that ur render blends in, and in ur sig you used way to many colors, that just dont blend well
2. as for font goes, the fonts you used are alrightt but to be more creative go to dafont.com and download some fonts
ASLO
USE LOTS AND LOTS OF TUTORIALS
tutorials are the best thing a begginer can do to become better,
its as simple as going to google, and typing in photoshop ( cs4 , cs3 or whatever you use ) sig tutorials plenty of resources will come up, trust me keep on working you'll get there