Is there any taboo to ps the baby's photo on the lotus?

It's like going to the temple to take pictures, taking some pictures of eighteen arhats and so on. And developing photos. If you provide it to them, you will have something to say. If you make a sacrifice, you will bring yourself potential psychological pressure for a lifetime because you believe too much and are not expert. This is not superstition, but a hint.

It's best not to take pictures like this. It is ok to put a lotus beside you, but don't let your baby sit on it. This kind of photo is now used for vows. Or use it instead of the body, body double.