I've never really done a critique before, let alone for a stamp, but this one is pretty deserving!
The color scheme works out pretty well, keeping it in the "cool" reds category (yes I know the background is a mauve color, but whatever), I would have to say though that the red heart should be toned down a little bit to match the scheme of the background and minimalism of the white lettering. Maybe a darker red, that has it's opaqueness turned down to 75%? Or a brownish red color perhaps?
I love the font style that you have used for the stamp, gives an illusion of handwriting, although we know it isn't . And for the subject, with so many other kinds of "OC stamps" it is a nice breather to see one that is simply "Loving your OC's"!
Words alone convey a thought, but how this was executed brings warmth to that thought!
I love how this stamp turned out ^^ And mostly how the background turned out for you ^^ and I'm using this as a stamp and how the heart looks with the text feature and the detail ^^ The font gives it like you wrote it and I think you did a wonderful job on this stamp ! I love it .The whole stamp makes it look beautiful and more... I will add this because I do love my OC'S .And the work was well done ... I love it alot Keep up the good work and i'll keep on using you're stamps .