Oh my.
Well, first, I corrected that little BBCode error you made there.
It looked like this originally:
[spoiler][img]http://[url=http://www.freeimagehosting.net/][img=http://www.freeimagehosting.net/uploads/5b23332509.png][/url][/img][/spoiler]
That's quite a nightmare! But yeah, I think the "IMG code for forums" isn't the same type of BBCode as our forum here. Just take the direct link instead.
Not to mention now, your image got resized. Probably not a good thing since it's a tileset. ...I think
http://imageshack.us allows high dimension images. I'm not sure. The resize might also be because of a space issue (i.e. it's too many kilo/megabytes). Uhh, I guess you better find another web site to upload that on.
I like the Weapon icons. But some parts of it aren't very consistent, like the First aid kit compared to say, the syringe or grenade. Not much to worry though.
Overlay's pretty cool. Now we just need to skin tone them up and we'll have a bona-fide zombie, ready for some brain munching.