XF 1.5 To change the unit with attachments (photos)

How do I change the display of attachments? I don't need all this extra information on the right. How to remove it? Write a single image. Preview image to do more, for example 150 × 150 pixels.

Information about the number of hits, file name and its size, can be displayed when you hover the mouse on the thumbs.

Brogan, of course thanks for the tip, but I need more detailed help in this question how to do it, because I have not very much knowledge in CSS.