If you have a Mac... right click on your most recent image and open it in Preview, you can then click on tools, inspector, then click on the bubble with the "!", exif, and look for "image number"! Easy!
If you don't have a Mac, you can do it in just a few steps:
1. Take your most recent image and upload it to your flickr account just as it is, sooc.
2. Click on the image you just loaded and find on the right sidebar where it has the name of your camera. Click on it.

3. You'll then be looking at a screen of Exif data like this:
Scroll almost to the bottom where you'll find "Shutter count." As you can see here, mine's on 7564.
That's it! How many times has your shutter clicked!? Have fun playing with your camera! ;)
