Be that as it may, it's not the excuse given for her Appearance.
The "excuse" given for her appearance is that she was severely injured and disfigured in a spaceship crash, and the Talosians lacked sufficient knowledge of and familiarity with humans to do any better job at fixing her than they did. You're being incredibly over-simplistic in your reading of "they had never seen a human; they had no guide for putting me back together." By fixating purely on the superficial visual aspect, you're ignoring all the other blatantly obvious implications. If they had never even
seen a human before, that
also means they had no practice at physically working with human anatomy, nor training in the most effective surgical procedures for repairing it.
How would knowing that humans
shouldn't have a hump be of practical use in preventing her from having one, if her bones were shattered and dislocated, her muscles and tendons a mangled mass? They did the best they could, given what they had to work with. That
doesn't mean they thought that's what a human was
supposed to look like. You're acting as if they
intended her to look exactly as she did after they worked on her, deliberately arriving at that specific aesthetic result without any missteps or intervening complications, despite having zero experience in reconstructive surgery on a human,
because they'd never encountered one before.
Reading Vina's mind would not give them that experience, nor the materials to put it to effective use. Let's say I wrap my car around a tree in your front yard, wrecking it all to hell, and I ask you to fix it for me right there in your garage. How much will my handing you a photograph of what it looked like the day I drove it off the lot help you in actually getting it to look like that again? Not much. It's certainly not going to give you a sufficiently useful "guide for putting it back together" piece by piece. Knowing it's
supposed to be symmetrical is not going to facilitate it being
made symmetrical if all the structural components on one side are twisted and deformed. Knowing the wheels and headlights are
supposed to be straight is not going to teach you how to properly align them.
She suffered
extensive injuries in the crash, and mind-reading or no mind-reading, they didn't know
how to get her straight again. If bones aren't set precisely, they won't knit in the proper configuration, they won't be the same length or shape. You will be crooked. You may have a limp, and yes, even a hump. (It's called post-traumatic kyphosis. I Googled it.) If there is nerve damage, your facial features may droop, your movements may be uncoordinated. If things are not stitched up neatly and cared for meticulously afterward there will be extensive scar tissue. Fluids may collect, abscesses may form. If a careful regiment of physical therapy and other post-operative care is not followed, there can be any number of complications in the recovery, including loss of muscle tone and mobility, and further deformities. Avoiding all of this requires a
lot more than a mere picture of what someone looked like before the accident.