A little splotchy and uneven tbh. A light steel-wool or scotchbright might help to blend it together some maybe, but generally it's pretty impossible to get sprayed on and brushed on paint to blend well.
Marking pencils are supposed to be water soluble, but yeah, they can be resistant sometimes. I actually don't bother with em and just paint the masking fluid directly onto the stencil cutouts, but you gotta accept a little more in-exactness working that way.