Dit is stiekem
"This is secretly"
Because the text is incomplete, I'm assuming it refers to a secret action or object. So, I'll fill in the gap and assume it describes a secret garden.
"This is a secret garden"
Now, for the AI to generate a detailed picture, we could give a more detailed description, emphasizing the 'secret' aspect.
"This is a secret garden, hidden behind a tall, ancient stone wall, covered in vibrant ivy. The entrance is a weathered wood gate, slightly ajar. The garden itself is a lush paradise full of colorful blooming flowers, tall trees providing shade, with a clear, sparkling brook running through its center. A stone path winds its way through the garden, leading to a quaint