To do good imaginative work takes references, I'm afraid. I have the same problem. But a lot of good imaginative work starts with a lot of planning, a lot of hunting for references, and a lot of trial and error. And also, your imagination muscle needs to be exercised as much as your practice-from-life muscle, which seems to be going just fine for you. The woman in #63 delights me, I know that reference and I know the colours aren't that vibrant and awesome, so good job.