Does nose height decrease after surgery with silicone?

Given the amount of time that has passed since your rhinoplasty, what you see now is likely to be what your nose will look like.

After over two years, the swelling is likely completely resolved. If you feel like your nasal bridge is too high, you can undergo secondary rhinoplasty to change it.

From the front view, the bridge appears a little too narrow. Additionally, you can see the outline of the implant from your side view photo which can happen with silicone implants. I would recommend considering a DCF graft to provide a more natural (less operated on) look to your nose.

You have to give yourself some more healing time.  Your nose and surrounding areas are going to be swollen for a while and you should be consulting the surgeon that performed the procedure but give yourself some time before going back in so some of it can subside. It can take up to a year for final results.As a specialist in rhinoplasty surgery as it pertains to ethnic rhinoplasty, I can tell you that these are the most common issues I hear patients discuss with me regarding their reasons for wanting to alter the appearance of their nose while still maintaining their ethnic identity:
Asian rhinoplasty patients discuss their dissatisfaction with the following: 
Flat nasal profileSlight nasal bridgeFlared nostrilsWide nasal tipPoor nasal tip strengthI employ specialized surgical techniques for Asian Rhinoplasty and my number one goal is to have a unified vision with my patient. I do not want to harm a patient's ethnic identity, however, I want to allow for each patient achieve the very best results they can and that occurs by having a highly personalized and customized surgical plan. I have over two decades of experience in facial plastic surgery and am able to preserve the ethnic characteristics of my patients while delivering the results they desire. 
When selecting a rhinoplasty surgeon, it is of the utmost importance that you choose a surgeon who is board certified in facial plastic surgery. Board certification matters. Especially, when you are considering ethnic rhinoplasty. You want your face and nose in the hands of an experienced and qualified surgeon. 
I am including a website link about Asian Rhinoplasty as well as video that discusses in detail the specifics of this procedure. I hope you find this information helpful. Please feel free to reach out to our New York City office if we can help answer any questions you might have in your decision making process.
Sincerely,
Philip J. Miller, MD, FACS
Double Board Certified Facial Plastic Surgeon

It's difficult to make an accurate assessment without an in-person exam. 
Consultation with an Asian rhinoplasty specialist experienced with autologous grafts will help you to carefully weigh the available options.