If you don't have a paid membership upgrade you are limited to the number and data size of the pictures you can upload to the site. Go to your user CP and look at your albums. You can delete old pictures to add new or use a paypal account and pay to upgrade your account to have full site features granted to you.
ETA: When you go to upgrade my membership it will show you a chart of all the features for all levels including free membership.
So you could delete some pics, or you could become a Premium member (500MB of storage)...
10MB of storage is not very much, since the average JPEG image taken by a phone can be over 1MB these days.
You could squeeze more photos in if you downsize them in resolution (down to 72 dots per inch) and size (less than 800 pixels wide).
Well, I've enjoyed your pics of Ozzy so I hope you figure it out.