Hi Anis - so looking at your curve framework there, you do seem to be trying to incorporate the opening for the face into your initial surface. Instead of that try to focus on making a more regular shaped full dome base surface. Also things like some small ridges can be added in by cutting out some portions, the steps that lyes showed in that previous link can be good for that.

Try to get a more simple smooth full surface first and then you will cut away some pieces and add details in small pieces to that, rather than trying to incorporate details into your base surface directly.

It also seems like a good case for doing control point modification of a sphere as shown in those previous approach as well.

- Michael