The ReactOS logo needs to be painted "transparently", as done in the "System" (sysdm) CPL.
See the userinit_screenshot.png for how it currently looks if a different window colouring is used.
Drawing mismatch at userinit LiveCD dialog
sysdm patch for using a masked ReactOS Logo, lights up a drawing bug
sysdm: logo bitmap should be masked out with bitblt
Audacity: black background for some toolbar icons