Start by drawing an open ended potato
From the potato draw a curved line diagonally for the back, then loop round and back to make a tail
From the other side of the head, draw a J shape to give the T-rex a bit of a pot belly
In the space between the belly and tail draw a semi-circle and a little line (almost a question mark hidden behind the tail). Then, from the belly, add a wavy line and some zig-zags on the end for toes.
Add some more wavy lines further up, and either side of the body. Again, add some zig zags on the ends of the arms for claws.
On the head, draw a circle with another coloured circle inside it. Add a diagonal line along the top for an eyebrow to give him an expression of pure rage!!
Add two tiny lines at the front of the head
Finally draw a long oval under the nostrils and add one final zig zag through the middle to give your T-rex the teeth of a mighty king! RARARARARARARR!