Many standard zebrafish developmental images are in this publication. If it doesn't have what you want, you can probably find something more specific by looking on zfin.org or doing a google image search. http://www.mbl.edu/zebrafish/files/2013/03/Kimmel_stagingseries1.pdf
Hi Monika, here are several links to full-text publications with numerous reference images, including fluorescence images and line drawings, that may be useful to you: