It’s fine. Put a decorative screen in front of it.

It’s fine! Stop staring at it :-)

It looks fine. You can always spray it again if you prefer some contrast. My concern would be if you ever wanted to have a fire in the fireplace....your painted finish could be flammable and/or give off fumes which could make you sick. You will probably be required to disclose the painted fireplace interior when/if you sell the house.
Meanwhile, buy a decorative screen to complete the look.

It should be dark. A real fireplace wouldn’t stay looking light and airy for long.

It’s beautiful but it if it bothers you as much just paint it the same shade as the outside box

It’s fine. A beautiful fire screen will be the focal point anyway. Just don’t buy a black one. And yes, you cannot use this fireplace if you spray painted the brick!

You were just used to the lightness; it’s fine and your lovely art is what captures your attention.

It looks fine. What kind of paint did you use? Interesting, this high heat paint is labeled ”extremely flammable.”

I think it’s beautiful!!! Maureen made a great point, your art really is the focal point and it no longer has to compete with the lightness of the brick.

it looks great...here is mine in a 1956 ranch.

Lovely, I like it

I love the look ! Anyhow ..others have said it here ...it would eventually turn black . This is a great look . Enjoy your beautiful living room, have a fire and celebrate !