Ah, I use a hyperlink to the image url to do that. It's a little extra work, but worth it.

< center > ! [ Invisible text ] ( image URL ) [ < sup > Funny Title < /sup > ] ( image URL again ) < /center >

That's the formula I use. When you drop a photo in, just cut and paste the URL part and add the sup / title between the two, then add the center and /center bits.

The sup is superscript, which just looks a little more like a title and I am still undecided about whether I like it centered or not. Looking forward to your photos!