As another someone with aphantasia, I remember what something looks like, so I draw what I remember. That memory is not an image, it's knowledge of what something looks like. For simple things, that's enough. For complicated things, I sketch out what I remember of the overall appearance, look at it and gauge how far off it is and what is off, and add in details to gradually reduce the difference.
I'm not a very good artist, so it'll always look kind of bad, though oddly it doesn't feel like aphantasia is all that much of an obstacle to my ability to draw. It's more just skill in making things look "right", skill that is learnable and seems like is necessary to learn by anyone, include those without aphantasia.
It's difficult to communicate to someone without aphantasia, because to them apparently the memory of what something looks like is an image. It's similar to the question about whether I dream in color. I mean, I dream in color just as much as I read in color. If asked, I could tell you what color something is. It's part of my knowledge of what that thing looks like. But knowing what color something is and seeing the thing in color are definitely not the same. I don't dream in images at all. I certainly don't dream in "black and white". Colors and grayscales only have meaning in an image.
(And maybe it's just me, but if the color of something never strikes me as an important characteristic, I will have no memory of what color the thing is. Right now, I couldn't tell you what color the walls of the next room over are, despite seeing it every day. Even though I could probably roughly model the entire room and get the dimensions and positions of everything about right.)
Though I'm skeptical that "normal" people are as restricted to images as their descriptions often imply. Not everything is 2D, so memories are going to have to include at least some shape information. And I'm sure you have all kinds of associations of the texture and feel of things you visualize, and if it's prickly how much it would hurt to bump into it or hold it in your hand. Memories are rich multi-sensory things, and they aren't just limited to point-in-time sensations either.