technically, the seller is not infringing your work. the infringements are:
1. using nf logos
2. whoever took the photograph of rgb that you used for the illustration
as you dont own rights to the original photography (of rg3 or the redskins player), your rights have not been infringed. since you did not intend for the image to be sold, and could be considered a parody, you are not infringing on the original photographer's rights
IANAL, however
1. using nf logos
2. whoever took the photograph of rgb that you used for the illustration
as you dont own rights to the original photography (of rg3 or the redskins player), your rights have not been infringed. since you did not intend for the image to be sold, and could be considered a parody, you are not infringing on the original photographer's rights
IANAL, however