Your camera has a lot of very clever programming built-in, which is why it is capable of producing some very good exposures on auto. However... if your specific situation is not understood by the camera's algorithms, then the result may be different from your expectations. When you do things in manual mode, you are substituting your own evaluations and judgments. With knowledge and experience, your efforts on manual will usually beat the camera's algorithmic selection on auto. So... let's start with the light - it is low and warm, which is good. However, it is also creating some strong shadows, so the shadow side needs some fill (either reflectors or fill flash), which would have lowered the very strong shadow at her nose. The background is too distinct, which means you are using a small aperture (small apertures like f/11, f/16, f/22 all give a deep depth-of-field, which in situations like this is usually not the desired effect). I will leave comments on posing to those who know these things.
If you're interested in doing some things with you making more of the decisions, consider using a mode such as Aperture priority, and experiment with the images trying to shoot the same composition with very different apertures. By looking at the results after the shoot, you'll begin to see some patterns in terms of what the settings are giving you as visual results. Build on this knowledge and you'll slowly start to understand how the different setting play out in terms of the visual effect. Hey, we all started as beginners. So there's lots of hope.
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