Adventures in Sourdough - Day 2

Here we are, day 2 on my sourdough challenge.  My starter culture had thickened and I did have to give it a stir to combine the separated liquid, it really did look like yoghurt.  The next step was to add flour, 4oz (120g) of strong white flour to the yoghurt mixture and mix well.  Now it just looks like a thick batter, here is a view down the next of the jar ...

Here's another of the outside of the jar, just because...

The mixture now needs to remain at room temp for 2 days; at the end of which the mixture should be full of bubbles and smell pleasantly sour, apparently.  Heres hoping!