These stages that you have mentioned are quite similar to what I am experiencing while practicing trataka.
trataka itself can itself become a meditation and take you to samadhi. It is different to antar mouna because trataka is a concentration exercise on a yantra, candle flame, picture or mental visualization and is only used to train the focus of the mind. Antar mouna, on the other hand, is about learning to withdraw from the senses. So it is important to only focus on senses - switching between hearing and just watching the content of the mind behind closed eyes induces the first stage of pratayhara. You will start to see your thoughts as soon as you you enter pratyahara and they will become more and more vivid as you get into deeper stages. Initially, they are just like a series of 2D snap shots, that appear and disappear randomly. Later, they will become 3D live images, that it will feel like you are living them.