How to change a photo to high res?

I sent a photo by email to an employer, but they replied and said that the picture was too small and asked if i had a high resolution file of it.

Just wondering, if its possible to convert it to a high resolution file, or do i just reply and say that i don't have a high res of that picture?

please help!

it is extremely important!How to change a photo to high res?
hmmm i have never heard of that... i mean if that is the smallest you have, you can't make it bigger, it will just make it all fuzzy. i would say no i don't have one cause you dont... once its small you can't go back, sorry

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