One thing I do is look for hi-quality, hi-resolution images to work with. If not, I resample the images to 200% or 400% using anti-aliasing even before attempting to start. - Harry Mudd

The higher quality the image the easier it is to work on and the better it will look. - General Statement

Increase the picture which you wants to process to 20-30 MB. the interpolation must be adjusted to BICUBIC. (Preferences/Gerneral) you will see, if the morph is ready, and you reduce the picture that the quality is much better.
Example: you have the picture with a size of 3000 pixels height--1500 pixels spreads processes.... then you reduce it to 700 pixels or less...... I'll leave the surprise for you :)) - Martin Brummi