The digitally altered photographs do appear realistic by a very experienced rhinoplasty surgeon. The Dorsal hump can be shaved down, the tip lifted slightly, and it's important to release the depressor septi ligament which pulls the tip down when smiling. The tip of the nose can also be refined as well. For more information and many examples, please see link and the video below
Yes, it is very possible to achieve a straighter dorsum and elevate the tip a bit. The goals seem reasonable.
Thanks for your post. Based on your morphed photos, I think the changes appear reasonable. What I would suggest is that you have an in person consultation for a more detailed examination. Also, computer imaging can be performed in office based on discussion of your nasal concerns. Rhinoplasty surgery very commonly addresses issues like a bulbous and drooping nasal tip, and dorsal hump. Hope this helps!