Hi. I really like the birdcage veils too. They're so pretty. I can't see why you couldn't wear your hair down! It's your day - you can do almost whatever you want! If it's looks good on you, then go for it!!!
As to the pictures, beside the black "Post" button is a button that says More reply options. If you click on that, it should give you another button on the left to upload attachments. There is a size restriction per upload of 5mb but if you then preview the post before you actually post it you should see the picture there instead of a link and that should allow everyone to see it.
Good luck! I've been around for a while but still not that good at all the little ins and outs of how to do things! lol