My tip is to always use a clean brush with no product on it to blend out your eyeshadow. This helps prevent muddiness. Also, if you use a smaller tapered blending brush you can ensure the colour is blended in a precise area so it doesnโt transfer too far up.
PAT McGRATH LABS Mothership VII Divine Rose - Eyeshadow Palette Divine Rose (10 x 1.;32 g)
Sigma Beauty E35 - Tapered Blending Brush