Many people upload their pictures directly here, despite the maximum size per post. Others prefer to use an external host and then use the 'direct link' URL to get the picture displayed here.
Until fairly recently, either method was just as good. However, looking through older posts on this site, it's quite apparent that external hosts cannot be relied on. I've lost count of Photobucket and TinyPic links that are broken and therefore there is no picture displayed. And last year, Dropbox broke all links to existing shared 'Public folder' links all over the internet.
So, despite the upload limit - and there are ways to reduce file sizes if you ask, or look in the appropriate 'sticky' in the beginners forum - please upload your pictures direct to this website, and future users will thank you when they see the accompanying picture actually displayed. Thanks!