slight trouble when visualising

[Jonathan1]

ok so ive begun the meditations recently and have a little bit of trouble holding the visualizations of what im supposed to visualize another problem is when trying to visualize white light for aura cleaning or other things its not very intense and somewhat transperent or ghost-like i can concentrate and bring it bright white for a few seconds but then it drops back down

anyone else experience this when first starting out and do u think it will get better over time?