To improve the image you might want to make a shadow screen that mounts around the eyepiece or telescope and casts a shadow onto your projection screen. We wish you safe observing and would be happy to answer any questions you have about safely observing the Sun. The image of the object is always there. All the projector does is make it possible for you to see it. Suppose you point your pinhole projector at the Space Shuttle sitting in bright sunlight on its launch pad.
Light reflects off the nose, the cargo bay doors, and the rockets.
If you held a piece of white paper near the shuttle, some of that reflected light would shine on the paper, but it won't look like the Shuttle. That's because the light bouncing off of each piece of the Shuttle ends up overlapping with light bouncing off every other piece. There are an infinite number of images of the Shuttle on the paper, but they overlap with one another, blending together into a uniform smear of light. A pinhole projector prevents most of these images from reaching the projection screen, wall, or other surface on which you are focusing the image. Only a few of the light rays reflecting off each part of the shuttle will be traveling in a direction that will let them pass through the hole.