Left side seems a bit bland. There seems to be a bright spot above the warcraft (?) char which immediately draws attention.
It's a little bit too sharp.
The line is annoying, doesn't fit in the piece.
The hand of the GOW char seems to disappear.
The red flare (?) on the left side could use a bit more merging with the background.
Overal a nice signature, main points for you to focus on is background and blending.
Finding a good balance between blending and making things stand out.
Massive props for the teeny tiny cross at the upper right corner, probably the best part ofthe signature, can't stop looking at it, it's lovely.
I hope this helps you, Hyde.