1800 - yikes. Bit more than 100
Is that pre or post milkshaping (cos they look like triangles in you images and 900 maya isn't so bad)?
Looking just at the shading, there's waaayy to many unneeded polys on those wings. If they're flat just use a couple of big ones. For example, early Peridhil:
That shape is 300 polys in milkshape (give or take), because there's only polys for significant changes in shape. Later on when it needed a slightly rounder saucer I added in a few extra segments, but even so only where I needed to. Fully detailed and finished she's still less than 1800 in milkshape (700 odd maya).
The other thing to remember is that some detail can be textured in. Everyone likes to see proper detail, but things like panels, gun ports, canopy lips will really kill the poly count - and this is a fighter (aka spam).
Don't take this as criticism, she's looking very good and I'm impressed with the speed in which you did it. Just offering some advice (so you don't have to learn it the hard way like I did ). Keep it up.