One of the most important but overlooked aspects of climbing is the position of the hands on the holds. Typically beginning climbers do whatever comes naturally when they get started and unfortunately this often means crimping.
I find myself inclined to use the open-hand position most of the time. In this position, the fingers are extended, allowing a more passive gripping of the hold,as seen here.
After getting good contact,Jimmy sets up for the last move in a full crimp. A full crimp helps gain the necessary distance to the obvious left hold he is aiming for. It also helps resist the "barn-door" effect that this move produces as the climber's center of gravity shifts to the left.
Another option is an intermediate position between the two extremes. This can be seen in this photo of my setting up the last move on Clear Blue Skies.
Sometimes part of the difficulty in a problem is mastering the exact position of your hand on a given hold and potentially needing to transition through different grip positions as you move. Often you will find yourself doing unlikely things such as crimping a sloper or openhanding a severely incut small edge. Find what works best for you and don't hesitate to try all alternatives. Even just an inch of height gain can mean success so find the grip that lets you get it. However don't forget the dangers of intense full crimping. The power it offers can come with a high cost. Be careful.