To begin, I want to say thank you Ascenscion for this awesome tut'!
Besides being well done, it allows me to learn new very useful techniques!
I had noticed this tutoriel months ago and today I decided to make a try. I am not disappointed!

However, the reason why I raised up this subject is that I meet a little problem at the 40 step.
40. This part can be confusing for rookies. Ctrl+click on the River base copy layer in the layer stack. Click on the Paths tab (or open it if you have turned it off). At the bottom of the paths window click on “Make work path from selection”. Click on the Brush tool and then at the top of the screen click that little triangle to open the Brush Picker. Scroll down the list and pick the one called “Ornament 1” (it looks like a little wave or tilda). If you don't see this brush listed then load it via the Preset manager following the steps I showed you for loading up the patterns...but this time go to the Brushes folder instead of the Pattern folder. We need to modify this brush tip so open the Brushes window (Window > Brushes). Click on Brush Tip Shape and change the spacing to 100%. Click on Shape Dynamics and set the size jitter to 100%, angle jitter at 5% (set the control for this to Direction), and roundness jitter at 100%. Click on Scattering and set the Scatter to around 300 and the Count is 2. Make sure that white is the foreground color. Still on the Paths window, at the bottom, click on “Stroke path with brush”. When done, drag the path to the trash can at the bottom of the screen.

I didn't found the brush called "Ornament 1". It seems that I havn't this one on my presets folder.
If someone could tell me where I could find this brush, it'd be kind (or if someone could share it via the forum ).