Okay dude, sorry about being so blunt, but here's the situation:
Never post a screenie of a game unless you're spent a fair amount of time on it, perfected the lighting and just make it generally look good. Many users of these forums have a thing against the stock media, and rightly so. Your games can only be as good as the media you have (among a few other things...) but you will seriously need some more. Download some off the models and media section of the forum and make the investment of buying some media packs off TGC. They will make your game so much better. To use the lighting you have to insert lights from the markers section into your game, and right click them to adjust the propeties. It takes a lot of practice to perfect, so don't expect to get it right on your first (or seccond) go. Another thing you'll need to do is place entities properly throughout the levels. Never just place an entity for the sake of it, make each have a purpose. The choices of entities the better your game will look (hence lots of media).
I'd reccommend making a few sample levels to test out the AI, lighting and physics. Once you have a good grip, try making a stand alone game using all of your skills. Make it only about 1-2 missions though. Also, read the manual from cover to cover, it will tell you everything you need to make an awsome game.
The more you practise the better you'll get, in the near future, you'll be as good as any of us here.
Keep at it and you'll make some killer games in no time! If you have any other questions though ask the guys here on the forums, most of them will be more then happy to help.
Good luck mate!
-A13X
