Would an alarplasty or tip plasty be enough to make my Asian nose slimmer and more defined? (Photo)

Thank you for the question and your photos. Asian rhinoplasty typically includes treatment of the dorsum (bridge) of the nose, narrowing of the tip, and decrease in the thickness or width of the alar subunits (wings of the nose). In your case, the bridge is actually in a good position. So, narrowing the tip cartilages, adding some grafts for increased projection, and reducing the alar thickness would be a great plan.

It is common for Asians to request more definition in the tip of the nose and a narrowing of the base of the nose.  In reviewing your pictures, I agree that you have great height to your dorsum.  I would not suggest further augmentation of this area.In regards to your tip, I believe some modifications to this area would help bring you nose in proportion to the face.  The width of the nostrils would benefit from a reduction or an alarplasty.  This would require incisions in the crease where the nostrils meet the cheek.In regards to your tip, I would suggest increasing the definition in this area.  This is achieved by using a multitude of techniques including:1)  Cartilage Grafting2)  Cartilage re-orientation3)  Cartilage reshapingI hope this helps. 

I think you are a good candidate for both a tip plasty and alar reduction.  I also agree with you that trying to augment the nasal bridge would not be a good idea.  It's hard to do that and get it to look natural.