it doesnt matter how shitty it is, but you can do a little portrait of your SO, or you can draw their favorite character, if you struggle with art, the easier thing is probably drawing their favorite anime character or character from wherever and just follow a tutorial on youtube, or you can be wildly abstract and just make something cool thats inspired by them, its art, you cant go wrong. i'd maybe think of making this a supplementary present, i wouldnt make it the sole gift no matter how good you are.