Is it possible to achieve a lower nose bridge? (Photo)

Based on your photos, you are a great candidate for rhinoplasty. The bump can be taken down nicely and the tip better defined at the same time. That way, your nose should have a great improvement while looking very natural. Be sure to see a rhinoplasty specialist for consultation.

You have that hump, and that can be lowered.
More: it seems that your bridge is strong up at the top of the nose -- in front of your eyes, or just below your eyebrows, just above the hump. When the nose is strong there, if a bump on the bridge is lowered, it's important to reduce the strength of the bridge up there at the top, too, or your profile would resemble the profile of a Roman statue, where the profile of the forehead slides right down onto the nose, without that little dip we like to see in front of the eyes. Search for Roman statue profile to see what I mean. Your surgeon must pay attention to that, too.
Then, when a bump like yours is lowered, it tends to make the nose *look* longer, as if the tip had dropped, and I doubt you'd like that, so it's also important to elevate the tip, so the nose doesn't look too long to you after surgery.
How *much* to elevate the tip, or lower the bridge, or make other changes? We figure that out with morphs, well before surgery. I'd love for you to see some excellent professionally-designed morphs of what could possibly be done with your nose. Morphs could also help you identify better just what's bothering you, and help you set a goal for the rhinoplasty that's accurate for your tastes. Profile and three-quarter views would be particularly important in morphing your nose. (Side note: in my opinion, morphs should really be done by the surgeon, or he should direct an assistant as she makes the morphs. Morphs should be made with a constant eye to what actually *can* be done in surgery, for that particular nose, and the surgeon has that information and judgment best.)

Finally, remember that rhinoplasty is an exquisitely difficult operation to get right, and you should only have surgery if you are able to make yourself very confident in your surgeon's skills. The changes that your nose needs require advanced techniques, and skill that most plastic surgeons don't possess with expertise. For most noses, it's much better to not have surgery than to have inexpertly-performed surgery. Read my essay on how to stay out of trouble while selecting a rhinoplasty surgeon. And it also discusses how to take photos that are best for online evaluations.