The seam line down the front of the nose cone can be a pain to get rid of. I've seen a lot of nicely painted builds that have a glaring seam line down the front. What I did to get rid of mine was of course a lot of sanding, but ultimately in the end what saved me was Alclad Microfiller primer. Filled in the seamline nicely and just needed some light sanding to get rid of it.
Also the front vent intake. If you want it colored steel and don't want to have to worry about trying to handbrush the intake, paint your desired color first. mask it off. Cut the mask the fit the part. then insert the masked off vent cover before you glue the two halves of the fuselage together. You can remove the mask with some tweezers once your model is all done.