So you have the one you want it to look like with her name on the tail, right? So that's your base image.
Open the original in DXTbmp, and go to Alpha / Export Alpha Channel, and save the image somewhere. This is your alpha channel. It's what makes the aircraft reflective and shiny.
Open your base image with the name on the tail. Go to Alpha / Import Alpha Channel, and select the alpha channel you exported from the original.
Then save the image as an Extended Bitmap / DXT3. This is your completed image.
Make a copy of the original texture folder, and rename it something like texture.name
Then replace the original image with your new completed image.
Put the new texture folder in the aircraft's folder, and add a correct new section in the aircraft.cfg.
Then, fly!
