I've got two thumbnails which I've done and I'm just pressed for what the general consensus is around them and what people think of them. I was also thinking of removing the text explaining what they are.
Without personal Image
With Personal Image
it has a picture of cookies... you don't have to write the word 'CHOCOLATE CHIP COOKIE.'
It's like you have a picture of a BALL, and you still write the word BALL on top of it.
Your title on the picture should be something like "SECRET RECIPE"..... or something like that.
I think people prefer to click "SECRET RECIPE" than "CHOCOLATE CHIP COOKIE."
And instead of you looking at the camera like a family photo, tried to give EXPRESSION to your face...
Since the title is "SECRET RECIPE," maybe you should act something like hands covering your mouth or like.
You are wearing a somewhat blueish color, and you also choose a blue background.
Try another color for your background.
Add some more brightness and contrast.