In pic no 2. the egg and sugar has turned more frothy and a bit pale after beating on high speed for 3 min. This is a good sign. Keep beating on high.
Beat on low now to set the mixture. At this stage add the melted butter.
Now add the dry mix little by little and cut with a wire whisk.
Last add in the milk and fold the mixture very gently.
I used a mini loaf tin for this cake, pour the mix into the tin by pouring the batter from a height to form ribbons, this will give you a light and moist cake.
Bake at 180 c for 30 min.