If you're seeing bubbles in your airlock, there's activity. I guess I don't understand where you're expecting to see the bubbles. The center of your airlock is where the gas is going to escape, so it would make sense to see bubbles coming from that area. But, I'm still a noob myself, so......
Nicely done. It looks like you are missing a piece of your airlock. They call it a three piece for a reason! CO2 should be coming up through the tube and into the upside-down cup, pushing the fluid down and escaping through the slots of the cup. Doh!
If you don't have the piece at all it is OK. Just get a few feet of vinyl tubing and shove one end into the tube of the airlock. Put the other end in a pitcher/gallon jug/mason jar/ANYTHING so that the end is submerged in sanitizer or water. gas will come out of that end and bubble up
you dont need it in that far either unless thats the only way you get a nice fit, in my experience that makes it easier to get a clogged airlock during very active fermentations. pull it out a bit if possible.