You could try
Sahelanthropus tchadensis, Orrorin tugenensis,
Ardipithecus ramidus,
Australopithecus anamensis, Australopithecus afarensis,
Australopithecus africanus, and
Australopithecus sediba. Google any of these, and you will find pictures of their fossils, as well as a great deal of other information.
Of course, these are not transition species in the sense that they are descended from modern chimpanzees, although some of these species may be directly ancestral to human beings (genus
Homo). However, they are closer to the common ancestor of chimpanzees and humans than we are, and they are more closely related to us than to chimpanzees. In particular,
Sahelanthropus and
Orrorin are probably closely related to the true common ancestor of chimpanzees and humans.
I have downloaded images of the skeletons of
Australopithecus sediba (left and right hand skeletons of left-hand image) and of
Australopithecus afarensis (middle skeleton) and the skull of
Sahelanthropus tchadensis.
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