Some things to watch out for.
Tucks like this one are too shallow to be effective, as there isn't going to be any resistance at the bottom corners to prevent them from spreading out when the hammer blow arrives.
Here's the opposite extreme! This is one of the ugliest tucks I've ever made, and I crafted it up special to show how not to make a tuck. This tuck is just asking to be knocked over to the side, which I am now going to do to demonstrate how bad things can get.
This is the last thing you want to see after you've been working on a part for a while. This tuck got knocked over to one side and crushed flat, which can happen a lot faster than you might think. It only takes a couple of fast hammer blows to make it happen, and you usually only notice that it's happening after the first strike, just when your hammer arm is likely on its way down already to deliver the next hit. If you see a tuck starting to lean over to one side after a hit, it's a good idea to stop your swing immediately (if you still can!) and straighten the tuck out manually before resuming.
Knocked over tucks like this can be saved sometimes, as long as a sharp crease hasn't been formed yet and you can find a way to peel it back open. Once a sharp crease has been established though, a crack will often form in that spot later on when you resume working in that area.
Ken