A couple of things you can easily improve on is contrast on the red with some highlights using a paint like Troll Slayer orange.
The second is that your white looks to be corax white which can be very hard to work with.
Generally you’re better off picking a warm or cool grey base colour, depending on the white you want, and then highlighting white. For example Grey Seer base layered with ulthuan grey looks like a cold white.
Where wraithbone layered with Pallid wych flesh looks like a warm white.
That said, your painting is neat and the scheme is solid so you’re off to a great start!