One of the problems you have with your model is that you've started off by drawing the side/front-on view and extruded it to make essentially a thick version of a cutout.
You need to use different techniques to model different parts.
Take the left shoulder shield for example. That is a round, almost sphere shape. Use a sphere as your base object and deform it to approximately the right shape. Then delete the surfaces you don't need to turn it into a shell, and move the vertices on the edges to make it into a nice, smooth(ish) shape. You can then apply division and smoothing.
Look at each section of the body in turn and consider how you'd model it to make the right shape. The upper leg of a Zaku is rounded, almost a barrel shape. You can't use a shape that has been extruded out the way you've done it to easily achieve this (well, you can but it's more effort).
Start by drawing a polygon of what you think that leg section would look like from the top down - an oval of some kind. Now extrude it downwards for a bit and and expand the size of the new surface. You now have something that looks like a chopped-off cone. Extrude the new surface down some more (remembering to delete the original). Now extrude it again and reduce the size of the end surface. You have something that looks like a cylinder that narrows at the top and bottom. You can now divide and smooth to get a rounded upper leg.
If there's enough interest, I could put together a tutorial or something.
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