You could also just copy the link to the photobucket album, even though that isn't as fun as having the pics show up in the post.
If you also have the pics on your computer, you could try clicking on the "insert image" button in the toolbar and see how that turns out. You can always test how big it is by preview post before submitting.
I usually run all my pics through that software that came with my camera. It downsizes them for email, etc.
Maybe someone else will have some other suggestions...