You have located several documents that suggest person A is the parent of person B. You ask another genealogist. Consider not telling them what you think. Instead ask them what their conclusion is.
You have a family picture that you think you have identified. Your identification may be a hunch or may be based on looking at other pictures or information. You are going to ask someone else. Also consider just showing them the pictures and asking them what they think.
In both cases, you want their actual opinion or conclusion. Not putting ideas in their head makes it easier for them to reach their own conclusion.
Then you can go from there.