[delluminatus]

Grammatically speaking, you might be best off with,

  Make good-looking pictures spectacular.

Or:

  Turn good-looking pictures into spectacular ones.

I think "good-looking pictures" is an awkward phrase that negatively affects the whole sentence. Personally, I would go with:

  Turn a good image into a spectacular one

or, brevis:

  Make good images spectacular

[MildlySerious]

Or "Turn 'good looking' into 'spectacular'".