Optimise your graphics, when saving for web from Illustrator or photoshop etc there are a whole series of controls to manage colour and image quality vs file size.
file size really depends on your image, if it has lots of colour and detail then the image is likely to be large. If the image has large areas of flat colour perhaps a different file format with a lower bitrate would yield better results eg 8bit PNG
There are a few other things you can do to reduce your image size. Adobe apps by default create files which are a little bloated because it has lots of adobe colour profile information, authoring details, icon data etc which is really useless when file size matters.
DreamLab
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file size really depends on your image, if it has lots of colour and detail then the image is likely to be large. If the image has large areas of flat colour perhaps a different file format with a lower bitrate would yield better results eg 8bit PNG
After I have created my game graphics I use a tool called <b>imageoptim</b> (http://imageoptim.pornel.net/)
Which gets rid of all that crap in the image file. As a simple test do a basic graphic and open it in text edit.
Compare the code between the Adobe app and the imageoptim version. Scary.
I can usually save a couple of MB on a whole game using this method.
DL