I am planning to tile my bathroom wall and removed the old vanity and the old wall panels which partly covered the wall. But, the condition of the wall is not good and I wonder what is the best option to make the wall in a good condition. The photo of the wall is shown below.
I see two issues. The first issue is that the plastering in the painted area was poorly done -- the area is uneven. The second issue is that I am not sure whether I can directly attach the tiles to the part where the wall panels were attached (the brown part in the photos).
Given this wall condition, what would you recommend to make the wall smooth? The possible options I am considering are
(a) removing the old wall and attaching a new wall (if sanding or skimcoating is too much work)
(b) attaching a new wall over the old wall
(c) thoroughly sanding the plastered wall
(d) re-skimcoat the entire wall
This is my first job of tiling and any advice is appreciated.