Movie size too big

I’m probably about to expose my serious lack of Flash here but here goes nothing.
I have created a gallery for a client. ( which has about 30 odd images in it. If I check the file size of the combined images in explorer its about 900k. The exported swf is 1.7mb. Am I missing something here. The ‘professionals’ will probably wince when I say I have used 11 scenes (each scene has 3 layers containing about 40 frames of alpha tweening) as there are 11 different pages in the gallery, I’m not sure if this is the problem. I can’t optimize the images any lower as I need them to be fairly high quaility. Is it the scenes, tweening…would using movie clips on one scene solve this?.[/font]
Cheers in advance.