It can be easy when you have a certain image in mind to get locked into attempting to get it, causing you to end up missing other great shots because you're either focused on the one in your head or frustrated that you missed it for whatever reason. This great video reminds us that it's important to keep our eyes and minds open when that's the case.
Coming to you from Thomas Heaton, this video follows him as he ventures into the forest with an image and composition in mind, only to find it less and less appealing as time goes on. He then stumbles upon a different image in a very unlikely spot: a parking lot. Nonetheless, he ends up coming away with a great image. I often run into this same issue writing music, and it took me a long time to know when to give up on an idea and to start looking for another, but often, it's those second attempts that lead to the most unique and interesting results. So, if you're ever out shooting and things just aren't coming together the way you had imagined, stop, take a deep breath, and start fresh. You might be pleasantly surprised.
Being a beginner I've found this to be true. A few of my almost ok photos were taken watching movement through the camera in lieu of putting it down and waiting for the next pose. Always searching and watching for needed lessons.