The ear thing aside, this is absolutely great work. Have been trying to draw it for some time but never had the nerve to complete it, but my sketches had an uncanny resemblance to yours (talk about the torvosaur that gave me lots of inspiration ). I think this is the first depiction of any big-headed, short-armed, big-clawed theropod that dares to show what this combination of features might have looked like.
My theory is that they could be used in conjunction with the jaws, on a similar fashion to the forelimbs of modern alligator turtles and helped the animal to tear apart chunks of meat that were too big to be swallowed- very handy whenever they encountered the carcass of some huge sauropod. They wouldn't have been as efficient as spinosaurs or other longer limbed theropods, though. Or maybe they're just halfway becoming vestigial stumps like the ones from tyrannosaurs and did not accomplish any particular function.
For all we know they could look like a bird's hole. If Scott Hartman most recent skeletal drawing of this animal is anything to go by, the ear should be placed further back in the skull and the general shape of the head is a tad different, more boxy and short-snouted.