How do I add an image to the paragraph block in WordPress?

When your paragraph has been created, add an image block on top of the paragraph block:

Paragraph block next to block search bar for image block
new image block

Choose an alignment (right or left) for the image by selecting the Change Alignment icon in the block editor toolbar:

alignment options for image

The image below has the alignment to the left:

image with left alignment

Next, select the desired image, using one of the options given (as shown above):

image next to paragraph

You can find more information regarding adding an image to text at: 3 Easy Ways to Place Images Next to Text in the Block Editor