HUDs and Menus

[Jamuk]

Hi, I'm working on sprites for an RTS game involving zombies. The units are going fine, but I am having trouble on producing the HUD and menus. I also can't seem to find any useful tutorials online as they are all about CSS menus.
Has anyone got any tips for creating these things as I can't quite get any nice shading or styling into them? I've posted what I have so far. Constructive criticism is greatly appreciated.

Thanks,
Curly