AITA for getting mad my artist hid her initials in my custom drawing?

My sister (f22) has been an artist for a few years. She recently got really into custom drawings, and I decided to support her by buying one. I found an image online I liked, gave it to my sister, and paid for the custom drawing. <br><br>When my sister gave it to me, I really liked it overall, but you can notice her initials hidden in the background. I asked her about it and she said she likes to put her initials in her pictures. <br><br>I was mad because I liked the picture, but I did not want her initials in it. I asked her if she could have made a hiding spot for them instead of just randomly placing them in without asking. I told her my husband also doesn't like this and he loves her art. She said it's just her style, and she doesn't ask permission. <br><br>My husband saw the exchange and thought I was right to be upset because we didn't want the initials in the picture. He told my sister she could've at least asked, but she's just doing this because one of her friends asked not to have them in a picture and doesn't do stuff like that anymore. <br><br>My sister said I was acting immature and selfish because it's just her style, and she isn't going to change it for me. She's getting ready for school to start and has a lot going on. I told her if she had just asked me, I would have been happy to wait for her, but she didn't care enough to ask. <br><br>My husband told her that they wont be buying another commission from her until they can get a sample picture without the initials. My sister said if they don't want the initials, to buy a pre made picture instead. She's mad I got upset and is blowing this out of proportion. I think she's being AH, but idk if I'm the asshole for expecting her to do what I paid for.<br><br>ETA: Just to clarify a little bit, when my sister used to do custom drawings, she would do them without the initials. The only time she puts them in now is with the custom drawings. I don't know why she switched to doing it only with custom or if she's going to go back to doing it with pre made too.