You could use GIMP. Or, if money allows, Photoshop.
You could darken a little his beard. After all, shave was not as good as now not so long ago ;)
Just a suggestion: try not to use patterns so you don't get moire effects. It would be better to use a "middletone".
Another idea: instead of using PNG, use some other layered format, so you can change colors by just adding another layer or changing layer colors.
You could use GIMP. Or, if money allows, Photoshop.
You could darken a little his beard. After all, shave was not as good as now not so long ago ;)
Just a suggestion: try not to use patterns so you don't get moire effects. It would be better to use a "middletone".
Another idea: instead of using PNG, use some other layered format, so you can change colors by just adding another layer or changing layer colors.