Rate my sig

pretty good, you might want to add some effects so that the spartan doesnt look so plain, unles thats the look you were going for

 

Its pritty big. But really nice. I suggest taking the bottom off up to just above the weight and moving the text to the spartan's head level.

 

Try blending the render in more and add a light source. Also add a border.

 

hhmmm
i like the background, it looks nice
the spartan could use some work however
it just seems like its there
try giving a different weapon, or making the weapon down
and try doing adding some effects so it blends him into the background somewhat
=]
4/5
you have potential i can tell

 

looks great for a first try keep going and try to blend him into the background a little bit just for astetics