It's fine

Turns out Acrylic paint dries wonderfully. Applying the masking tape over existing paint was no bother in the end. As long as I applied my de-stickiness technique, everything went fine.

This is the test page I chose to expand on. Not much to work with. So i addded red. A lot of red. Too much in fact.

It clashes horribly. Horribly. So I added more to it. I chose green, as it would bring forward the blue, and yellow as it was a friend of green.

And this is the final product. I like it much better now.