Where Tolkien has used both the names ‘Goblin’ and ‘Orc’ for the race, we’ve used the terms in the interest of gameplay to represent different types of Orc-kind. ‘Orcs’ are larger, brawnier creatures, whereas ‘Goblins’ are smaller, and the sort that might ambush you in dark caverns underground. Here is concept art of a Goblin.

But even among the creatures that are called Orcs, there will be visual variety. In addition to having variety in what weapons they wield and what armor they wear, they will also vary in terms of body shape, as shown in these concept images.