These dinosaur restorations done by the famous American illustrators are not so ridiculous. In fact, they are nice in their own way. However their restorations were already outdated at the time they were painted.
Frank Frazetta's T. rex (I am guessing that's what he featured in the picture above) painting for the cover of Eerie magazine, is a bit too large; posture too upright; head too box-like; eyes are all wrong and not facing forward; the teeth in the jaws are way too numerous and placed all the way to the corners of the mouth; the hands and fingers too long; the shoulders wrong; the neck unnatural; etc....
I like Richard Corben's much more, although this one is still wrong.
In 2012 a new species of tyrannosauroid from the Early Cretaceous of China, has been described. The giant Yutyrannus huali was apparently covered with proto feathers, or so called "dino-fuzz". An obvious dilemma arose: Were other tyranosauroids also covered with feathers, or were the ones that were living in the warmer climate featherless? Like the extinct Woolly Mammoth who was covered with thick, long hair and the modern elephants, which are almost hairless.
My Yutyrannus huali head restoration