If it's a self-portrait, why are you using video game portraits as your references?

It's always going to come out looking like other characters if you're looking at them while making the portrait. I mean sure, I could see using them for a technique or style reference, but the only way you're going to get it to look like
you is by looking at you. This will not only help you with any resemblance issues you might encounter, but also help you develop your own style, because get this: when you are drawing from real life, you get to choose what lines you want to place, where to place them, how thick or thin to make them, etc, so long as you get your message/interpretation across; when you are drawing from other people's art, you have to put the lines they put, or it will come out bad...and it becomes a tunnel, a train track, where you only have one outcome--the other person's drawing.
So, Stefano and rabidbaboy's edits, as they are intended to help show you the way anatomically or compositionally, they will never come out looking like you, because, odds are, they don't know what you look like

.
Get the technique down first, and go for style after, you dig?