Looks great!
That's what I've had to do for Sims 2 as well. I searched and searched for Metal Gear Solid characters only to find rather poor attempts. I wonder if these people even tried hard to make them! Well if they did, I give kudos for that, but I worked on Solid Snakes' face for many hours before I was satisfied, and in fact he is still not finished. You should see my Young Ocelot, he is almost the spitting image of the official character! But somehow, his face gets screwed up when animated sometimes....
It's unfortunate, but sometimes something you want is uncommon. MGS is a popular series, however, mostly guys play it, and mostly girls play the Sims (or its even, I dunno) and I guess many of them do not play MGS. I do not know what was your situation for your characters. But yeah, sometimes you have to step up to the plate and just make it yourself. In my case, I am very much a perfectionist about these characters (and since MGS is my obsession) so I'll make them myself, and really with passion so they will turn out AWESOME. It won't be easy and it won't be overnight, but by the time they are actually available for DOWNLOAD, they will be something the official company can be proud of. Hell, even the official company doesn't seem to care about reproducing their characters right! They have this life-size Snake statue, and it is UGLY! Doesn't look a thing like him! The hell?
But yeah, it is fun and rewarding to make them yourself, especially if they turn out great! It will be great for you, and other fans. But I do not know how many people still play Sims 1.... You should really try Sims 2, its fantastic! I never tried the first, but I heard of what an improvement they made. Not just graphics, the whole gameplay system got a overall. There is genetics, wants and goals, a whole bunch of fun stuff, and you can really make their faces practically exactly how you want.
But anyhow, it looks great. Have fun with your project! 