This isn't accurate at all. The serval and caracal are far too big, and the clouded leopard too small. The first few should go (from smallest to largest) - ocelot, serval, caracal, clouded leopard, lynx. Though pumas are classed as small cats, they are actually larger than leopards, so the puma and leopard should be the other way round. The tiger shown is a Bengal tiger (Panthera tigris tigris), though the name given is for the Siberian tiger (P. t. altaica). Smilodon populator, the largest of the sabre-tooths, was actually only about the size of a modern lion, though heavier, and the S. fatalis is too large, though correct in that it's between the jaguar and lion. The largest cats, from right to left, should go - American lion, tiger, S. populator, lion.
Also, most of the scientific names are written incorrectly, with the genus and species both capitalised. Only the genus should be capitalised. Many authorities now place the puma in the genus Puma, rather than Felis, and the snow leopard (Uncia uncia) is listed but does not appear in the line-up.