I edited nudes sent to me by a friend

This actually happened today. Throwaway account since most of my friends know my main account.

I M24 took a few years in photoshop and consider myself to be sort of good at it. I have a female friend (let's call her Ella) who I met about a year ago. She does some photography and modeling as a hobby.

To start off, I have a small photo retouching business. Nothing special, just a little side gig that makes me some cash on the side while I get my degree. Also, I have a business email set up that I use ONLY FOR MY BUSINESS AND NOTHING ELSE. My friends know this and they know to only send me things on it if they need any work done.

About 2 days ago Ella F22 send me a text saying, "Hey, I'm going to do a shoot today. Would you be able to take a look at some of my pictures when you get the chance?"

I replied, "Yeah sure just send them whenever and when I get time I'll take a look."

A few hours go by and I get the email. Now, let me say I am not the most attractive guy. I'm pretty short. I exercise regularly but I'm not super fit. My hair is really hard to work with and I feel like I could do a lot better in the looks department. Also I NEVER ask for nudes from ANYONE. I feel like it's disrespectful. Also, I've dated but recently got out of a really nasty relationship that left me feeling pretty self conscious.

All of this leads to the inclination that if someone is sending me nudes, it's probably not because they're interested.

Anyway, I get the email and it's about 20 nude pictures. Very tasteful and left nothing to the imagination. I figured she was starting an OF or something and since it's her body, her choice and I support my friends in everything they do, I touched them up early this morning.

I just cleaned up some blemishes, got rid of some stray hairs and razor bumps, and touched up some of the coloring. I also made a black and white set along with bit of dodge and burn. The long and short of it is, I spent a lot of time on it.

After all of that was done, I sent back the edited versions with the message, "Hey don't sweat payment. I hope this is what you're looking for. If you need me to take another look let me know."

She sent me a text maybe 15 minutes later saying, "This isn't what I was looking for at all."

I said, "Oh sorry, I just wasn't sure what you wanted. If you want me to go back and redo it I can."

Then I get the text, "It's fine. I g2g. Bye"

Super confused so I called her roommate (who I am also friends with) and asked if she was okay.

She let me have it. Started calling me dense, stupid, a jerk, and many other things. Through the insults I finally got the real story. Maybe I'm just naive, but I don't know why she would make it seem as if she wanted me to edit them when she just wanted me to look at them.

This just happened before I typed the post. I'm really not sure what to do. My last relationship kind of made me weird with dating, so I know I'm not ready. I want to feel like I'm worth something before I start dating again, but at the same time I can't help but feel like I did something wrong. Is there anything I can do to save the friendship?

TL:DR Friend sent nudes to me. I didn't realize the nudes were for my enjoyment, so I retouched then and sent them back. Now she's really mad at me.