I'm surprised nobody has pointed this out, but... those bedrooms are waaay too large. You just don't need bedrooms that big for ordinary dwarves. 2x3, even 2x2 is fine. The effort spent on larger rooms would be better spent double-engraving your dining room and scattering some other furniture in it... all your dwarves use your dining rooms quite frequently, so a high-quality one is an easy way to get you a big happiness boost with relatively little work. Bedrooms, by comparison, just make one dwarf happy, and once the economy starts they'll have to pay for even that.
I would consider making a more direct path to your lumber storage by digging straight up from it into the main hall.
Add more traps when you have a free dwarf! They're cheap and easy defense against the early baddies, and require almost no maintenance once you've set them up. You've got lots of spare mechanisms, so you might as well trap your main entrance and the area around your wells.
Doors can help a little bit with defense, too, and will keep a number of other dangers in check, like floods and miasmas. At least put a pair at either end of the corridor near your farm, to give you a chance to do something if it floods past that initial door. Oh, and place one by the entrance to the river unless you want your halls shallow-flooded for some reason (it doesn't really do much damage, but it can move things around and occasionally wash a dwarf out into the river.)
In a little while you should build a loom. Collecting silk and turning it into cloth is easy once you've hit the river... it's completely automated, you just need to have a loom as close as you dare to the river, and a dwarf with weaving turned on. They'll automatically collect new webs as they appear and turn them into silk... silk can make cloth for bags, ropes, and clothes, while also satisfying possible fey mood demands for thread or raw cloth. Although it's easy to collect, silk is hard to rush, so you should start gathering it as soon as possible so you'll have a big stockpile for trading or clothes or ropes or whatever when you need it. Well, it's not that hugely important, but it's so easy to get that there's no real excuse not to once you're sure your food is alright. And you do need bags for some things... getting them from silk is much easier than making them from pig tails.
[ September 13, 2006: Message edited by: Aquillion ]