Is a Hard Bump After Rhinoplasty Normal?

It's difficult to say.  Certainly bumps and lumps can and do occur after Rhinoplasty.  these tend to be temporary but without knowing what your nose looked like pre-op and what was doen to your nose during your Rhinoplasty, there's simply no way for me to know.  You'll need to have this discussion with your Rhinoplasty surgeon.

Numbness of the tip of your nose is universally seen in rhinoplasty. It clears in two months.  No residual numbness is expected.  For the bump on your nose, this is not uncommon even if the bone beneath has been reduced.   The skin is expected to settle down within the next 4-5 weeks. 

Most plastic surgeons use a series of digital nose images which define your existing nose anatomy, The surgeon then modifies the images with computer software to reflect your selection of the nose which you find attractive.  This is the image to which you can hold your surgeon accountable.   The difference between the computer image and your post surgical images should be very close the same anatomy.