If you're finding it hard to visualize or hold a mental image, try these methods to help clear your mind, balance your higher energy centers, or work with them more deeply.
I don't recommend doing this right after eating. Heavy, dense foods and drinks weigh heavily on the stomach and make it difficult to draw energy and awareness up to your upper centers—namely the throat, third eye, and crown.
The best times for visualization are right after waking up or about three hours after eating. Drinking water or a gentle fast can help the process (though I'm not saying you shouldn't eat at all, just to be mindful right before visualization, meditation, or breathwork).
Another important way to enhance the experience is to take a decent break from your phone, music, and all forms of screens where you use your eyes, as this zaps your energy.
Always in Our Heads
You may not be consciously aware of it, but most people today are already operating from their top chakras, using the third eye and crown for everyday life.
Because this takes up a lot of space, many remain unaware of what they could actually be using that energy for in terms of "spiritual work."
Think of it this way: when you watch television—"tell-a-vision"—it consumes the higher energy centers you need for your visual work. You're trading it all for short-term satisfaction that leaves you with nothing in the long run once the end credits hit.
Once you're aware of how important your energy is and how easily it can be consumed, hopefully you'll start looking after it like a brand new pair of white shoes.