Read up on EVENT routines, the ONCURRENT event, and IMAGE CONTROLS. Read up on VBA and String data types. Links in the Access Help files will lead you to properties of the various controls. One of the properties of an image control is the PICTURE - which is actually the name of a file that contains the picture. Other properties deal with whether the picture automagically zooms to fit the image window, whether it "tiles" instead, and whether it maintains the aspect ratio of the original image format. One of the properties is whether you LINK or EMBED. I've already made my position clear on that one. NEVER EMBED if you can LINK instead.
Create the form on which you want to show this picture. I'm assuming it will also show person's name, employee number, department, supervisor, approximate number of teeth showing when they grin, etc. All of this will come from the table that drives the form. (a.k.a. "underlying table") On this form, build an IMAGE control that does not have a pre-defined field as its controlsource. (That is a property of controls.) Leave the controlsource blank. This makes the image UNBOUND. I.e. nothing in it.
OK, in the underlying employee table, include a text field for the name of the photo file. If they are all .JPG (JPEG) files and all of them are in the same exact path, say, something like S:\Shared\Employees\Photos, then you don't need to store either of these. Store the file names for every photo. Naming conventions are more or less up to you. If you wanted to use employee number as a file name (after converting it to text), that works. If you want to take the first 3 letters of the first and last names plus the middle initial and a digit in case two folks have very similar names, that would work. But that is far from the ONLY way to do this. Like I said earlier, your call as to naming.
OK, in design mode, look at the properties of the form. Call up its properties. The list includes events. Double-click the box for OnCurrent. You will get a subroutine header and trailer built automagically for the event routine. Now just fill it in.
In the "Form_OnCurrent" event routine, the form has just been loaded with new data. The event "fires" every time you navigate to a new or different old record. The underlying record from the table is available for this employee at the time the event fires. It is a text field, probably.
So in that routine, you have to pick up the file name. You already know the path and you already know you are storing only .JPG files. (For the sake of argument, agree with me for a moment.) So using the constant string that is the path to your photo folder and the constant string that is your file time, concatenate (see "&" operator) the path, name, and type. Store that in the .PICTURE property of the image control.
Now... what if you have .JPG and .PCX as possible picture formats? Then you have to store the picture file's name and type instead of just storing the name. But IF you do this, ALL entries must include a file type in the underlying table. You would still have to concatenate the file name and type with the path.
What if you use different folders based on some arbitrary criteria - such as department or division or physical work area? (It could happen...). Then you have to store the folders for each entry, but don't have to do any concatenation at all.
Browse the Help files as I suggested and read over this slightly more detailed explanation. Then heck, just try it. As long as you don't DELETE anything, you won't hurt yourself too much.
Just to be safe, make a good backup copy first.