The best way to slim a bulbous nose? (Photos)

It does appear from your photographs that your nose has a bulbous appearance. The procedure to correct that involves examining your cartilages underneath and reducing the width by bringing the two cartilages together and removing the excess cartilage that may be present. Sometime a graft may also be required from the removed cartilage to further elevate and "tent" up the tip region to make it appear more narrow. I would recommend a consultation with a facial plastic surgeon in your area.

Click on the "Web reference" link, just below my response, or go here:
FacialSurgery.com/RealSelf/RealSelf_katiesxtn.html
I made a computer morph of your nose, and an animation of the morph, to show the changes that are possible for your nose in truly expert hands.Mostly, I narrowed those tip cartilages. When they get narrow, they don't appear as wide, but also, they don't seem to stand out separately from the rest of the nose, too. You tend to lose the shadow between the bridge of the nose and the prominent tip cartilages.
You should understand that the changes I demonstrated in the morph require advanced techniques, techniques that most plastic surgeons cannot handle.  Be sure to read the section in the "Web reference" link on how to stay out of trouble while searching for a rhinoplasty surgeon. 
I'd love to hear what you think of the morph. Did it seem to address your main concern?
Your nose is also a good example of why computer imaging is mandatory in rhinoplasty. You need to know exactly what the surgeon is planning to accomplish -- what features he thinks he can change, and by how much he thinks he can change them. When you see his goals, you'll know whether he has an eye for a beautiful nose, and whether he shares your opinion of what constitutes a beautiful nose. You'll also know whether the changes he proposes are enough to be meaningful to you, and whether he understands your wishes enough to address all of your priorities. But remember, you're not hiring him for his skills with the computer. The doctor must then show you his before and after photos to prove that he can actually accomplish what he draws on the computer.
In your case in particular, you need to find a surgeon who understands all of the issues I mentioned, and how they fit together, and who can actually accomplish them in surgery. You don't want to be looking for a revision later, to get the tip smaller yet.

Hello and thank you for your question.  Based on your photograph, you may benefit from a tip refining rhinoplasty. Your surgeon can accomplish this by trimming, suturing, and reshaping the cartilage in your lower nose. Make sure you specifically look at before and after pictures of real patients who have had this surgery performed by your surgeon and not just a computer animation system. The most important aspect is to find a surgeon you are comfortable with. I recommend that you seek consultation with a qualified board-certified plastic surgeon who can evaluate you in person.Best wishes and good luck.Richard G. Reish, M.D.Harvard-trained plastic surgeon