One of the improved ways to create a good impression on the original date is to concentrate on the little things. Pay attention to what she says and sooner or later closely, it is possible to subtly call compared to that topic and show her you’re being attentive back. The same can be true when the tables are turned. If she was into you, she likely paid more attention to the little details and asked you more questions than she would have if she wasn’t feeling it.
If later on in the date you found that she remembered details that you mentioned very casually in passing, that’s a sign that the date went well. If the date was going well, chances are you guys walked away with some inside jokes from that night alone. If you find her laughing about things that happened during the date later on, especially if they weren’t really that funny, she definitely had a good time, and you may safely mark it as a success.