PNG to Doom format conversion issues

[Geometri7]

Hi everyone,
Recently I decided to start a new resprite mod, this time I actually was making them myself instead of simply recoloring, so eventually I had to convert to Doom format in Slade. Of course, the colors were messed up, so I did all the things required for sprites to be fixed, however they are still wrong. What am I doing wrong? Is it even possible to keep the initial colors?
(P. S. yes i know the sprite is questionable)

[Jayextee]

Those shades of blue aren't in the DOOM palette. The conversion is doing its best with the nearest it does have.

[Kan3]

The best thing you can do is to export the Doom Palette and directly use that to make your sprites

[hawkwind]

You have Convert to Doom PSX (paletted ). Try Doom Gfx ( paletted ).

[Geometri7]

Hey everyone,
Thank you for advices! I guess I'll just resprite it directly in Slade so it'll look similar.