I'm Back On The Horse Baby!
Look at my horse its a really awesome horse...
Oh wait.... wrong piece.....
Cool, moving on...
One of the firs things I want to cover is one of the weakest things in the entire piece. The star field. I'm just really not feeling it. Even for some cheesy b-movie poster, I think you could have got a little further on it. I have seen some really awesome spacescapes out there and I think you could have used one to make not only a really cool star field but also enhance the earth in the background.
The over all composition I am rather pleased about. I think even when you start to break the box with the aliens in the bottom of the piece I think it works rather well with what you are trying to achieve with those classic posters.
The line art is ok, it is alittle dull and lacking some line weight. I'm having a similar issue myself lately so I know how frustrating it can be to think that you have what you need only to find that you don't. The coloring I'm sort of ok with but the shading I am not. You used a lot of gradients with this. IN some places you went ahead and placed a secondary highlights to emphasize the shininess. I think you should have ditched the gradients and went with the strong highlights and shading, I think it would have been much more effective.
One thing that keeps catching my eye is that in some places it seems like you have a grain filter on some things. like the ball on top of the flag and the red around the title. I think this would have worked if you had made the grain much stronger concerning the highlights. You could have given it a really cheesy glitter effect which I think would have reinforced the effect of your entire poster.
I think you have a good start and some cool stuff to work with here. Keep it up.