The first picture is very good in regards to the photography. The coral is excellent! The Montipora corals are looking very healthy. It appears the tank parameters are ideal for them.
I think patience is very important when it comes to the Acropora species in general. After 6 months if you don't get the results you are looking for (coloration or growth) you can move the coral to a new location with less or more illumination. Water flow can also be varied to change growth form or calcification (growth) rate.
Saludos,
Kevin