It doesn't look bad. Could use a few tweaks, and I could give a few suggestions, but I think there's one thing that will most help you out in finishing models. It revolves around the thickness of your paint.
I remember when I painted the same way. I did a He111 but didn't have any good colors. I had to mix 'em myself, and didn't have any paint thinner (note: brush cleaner is not the same as paint thinner!!!! I learned this the very hard way back then). When you mix paints they get thicker, especially if you just have the 1/4 oz. Testors basic rainbow colors on hand. And when the paint is thicker you have to slather it on more to get an even coat. This can ruin the look of the model if you're not careful (I ruined many of mine).
However, I would suggest getting 2 things (maybe 3, depends on the paint type you use).
First: Get some "airbrush thinner" if you work with enamels. Or get some Tamiya acrylic paint thinner. This stuff has a strong smell so use it and put the cap back on fast (and work in a ventilated area! Always when working with paints/thinners!). The testors acryl thinner doesn't work so well on all paints.
Second: Get some pipettes, or eyedroppers, or whatever they're called. You can get 'em on the cheap at most hobby shops. Never dip your brush into the paint thinner. Never get paint thinner into the paint jar. EVER. It speeds up the congealment of the paint, and next time you open the jar it'll be solid and rubbery.
Use a dimple palate. Use your brush or a toothpick, or carefully pour a small amount into one of the paint dimples. Then use the eyedropper to drop a bit of thinner into it. Mix in the palate. If you need to add more paint, don't use the brush that you've been painting with (it has thinner on it!).
So basically the use of paint thinner will definitely help your overall finish of the model, and greatly helps with custom mixing also.
Also, if you don't mind a small tip: Watch where your paint goes. Look under your wings, on the flaps, and you'll see that the green from the upper surfaces spilled over the edge and onto the other side. If you use less paint on the brush while painting, this is less common, but still check the surfaces while they're still wet and it's much easier to clean up. Touch up the mistakes (once they are dry) so that they're not visible.
P.S. You missed a small spot behind the tail gunner, underneath the gun!
P.P.S. I use acryls and enamels interchangably. I have both thinners. You just can't mix 'em together, and have to make sure they dry before applying one over the other.
