Hey there. Glad to have pulled in another with that tutorial. Welcome!
There's no shortage of excellent tutorials on here. I like the maps you've got there so far. Do I see a 4e influence? (the difficult terrain markers are a give-away).
You can post the images directly to here - the site's pretty generous on filesize. When you post a message make sure you're in the advanced view and click the paperclip to upload images. Then they'll be attached to the site and you don't need to worry about keeping your dropbox account consistent forever.