Here I have a screenshot before your eyes that I did.Also this was made with Leeumm's Effect with the prowler.
This is a good screenshot but it does have some bad points. For example, that blinding light on the helmet really subtracts from the screenshot as it is the only thing I can focus my eyes on. Also in the background the flood flesh makes it look like there is a horn sticking out of the character and overall looks rather armature. Only major advantage i can say is that the lighting on the outsides is impressive.
I have to agree with forgegod on all points. Seriously, that looks like a freaky growth coming out of his freakin head lol. I think it might be cancerous...
I do have some advice for you here. First, make sure you have an angle that depicts the spartan clearly. Having some blinding lighting and an aforementioned "growth" isn't the best idea. Another piece of advice, with the "prowler effect", make sure you go through every frame of the explosion before deciding upon a picture. Near the end of the explosion gives your spartan the bluish hue you saw in my example screen. Try multiple angles, as well.