Hi. Brit1234
I am sorry to hear about your loss. I hope what Ever you Decide to get helps you treasure the bond with your mom even more. Know that I too had a special loss, I decided to do some thing that symbolizes the bond because I have always been skeptical about Portrait body art, The Artist would have to be extremely good and Specialize in Portraits to get the portrait to be exactly how you want it.
I would go with a Portrait that reminds you of the times where you & Mom' were the Happiest & had that Strongest Bond...you would also want a Portrait that would always make you Smile! No Matter if she's older or younger. I hope it comes out Great! What Ever you Decide! :)