LizVicious

I met Stan a couple of times (once in Florida and once in San Diego), but only got his signature in 2018... It was a last moment decision, due to the incredible cost. The only thing I had at hand was a poster from 2009's: The Incredible Hulk. My son ran over and got it so I didn't have to get out of line. It came back signed by someone, but I have no idea who. I thought it was the concept artist, but idk. I have no concerns about Mr. Lee's autograph, as I watched him sign it. But who does the other belong to? Will it affect value? I noticed that in his later years, Stan's signature changed a little. His underline doesn't extend as far. Has anyone else had one like this graded? Did it affect value? Wth the above information and the images, should I send this out? Which services do you suggest (&why if you don't mind)? I know coins, but am new to memorabilia.