When you imagine the text inside the title bar, it looks too small. Lol I know how it is with naming things. But still good to plan ahead for letters. You could always use placeholder text, like they do in brochure templates and such.

You can play around with saturation and lightness of the colors to make the title bar stand out a bit more. It's not necessary to shift the hue, which could indeed look out of place if you overdo it. You could also try overlaying some colors that are already present in the image as well.