The photos you link don't seem inconsistent with the others. The two you link are from the front (stage side) looking out towards the crowd, and at a low angle

The photos you link don't seem inconsistent with the others. The two you link are from the front (stage side) looking out towards the crowd, and at a low angle so it's hard to see how far back the crowd goes, and how densely. The photos showing a smaller-than-Obama crowd are from a high angle, and from the back, looking towards the stage. Of course the front is filled in both, but the implication of the latter is that the Trump inauguration's crowds were significantly smaller, going much less far back. The official crowd estimates are consistent with that implication, estimating that Obama had over 1 million attendees, while Trump had around 250,000. Even 250,000 is a large number of people in absolute terms (larger than even the largest football stadiums hold), so from near the stage both should look like very large crowds.