Hi there,
You can add an image directly to the post, right before the contact form code. Make sure the image is either left or right aligned, and that it is small enough for the boxes to flow around it.
If you want the entire contact box to appear alongside the image, you can add the following CSS (after you have added an image that is either left- or right-aligned):
.entry-content .contact-form {
float: left;
margin-top: -24px;
}
Change the float: left to float: right if you prefer the contact form to be on the right of the image.
Let me know if you have any questions!