Vintage picture with velvet, Sotheby's white tag on back MANN PENNER SIGNATURE?

I bought this 11x14 portrait and the very small picture that looks like Lincoln, at a garage sale in Texas and I know nothing about ithem. The larger portrait Looks to be on oil cloth, purple velvet around as matting.  It has half of a whit sticker on the back that reads SOTHBEYS.  Would love to know more about it and appraisal. Signature on back reads Mann PENNER or Tanner??

the small one  has no markings.

would sell either