Why is the Enterprise XCV 330 not on the wall in Archer's ready room?

Question

As can be seen in the below image of Archer's ready room, there are four sketches of various ships bearing the name Enterprise:

Compare this, though, to to the below image seen on the Enterprise in Star Trek: The Motion Picture:

Now, the first three images in both pictures above are of the same ships. Then we get into interesting territory.

The Enterprise NX-01 isn't shown in the picture aboard the Enterprise refit from TMP. That's understandable out-of-universe, because Enterprise hadn't been made by the time they made TMP.

Yet, there is a ship between the Space Shuttle Enterprise and Star Trek's USS Enterprise on the Enterprise in TMP. I've found out that this ship is the USS Enterprise XCV 330 which, according to Memory Alpha, was in service prior to 2143, something established in Enterprise: 'First Flight'. The series Enterprise starts in 2151 according to Memory Alpha.

So, it's made pretty clear that the XCV 330 existed prior to the NX-01. We also know it was significant enough to be put on a display gallery on the refit Enterprise in TMP.

So, why is the Enterprise XCV 330 not on the wall in Archer's ready room?

Answer 1

This wall ain't big enough for the five of us.

According to Ex Astris Scientia,

John Eaves created an additional fifth picture, of the aircraft carrier USS Enterprise CV-6, which didn't make it on the wall. Overall, this "ship wall" looks like a very balanced and diverse selection of ships named Enterprise, a bit like already in "Star Trek: The Motion Picture" but with some retroactive continuity regarding the omission of the ring ship XCV 330, which is currently considered to be just a testbed for a new propulsion technology. The appearance of the XCV 330 in the 602 Club in "First Flight" and in Admiral Forrest's office in "Home" proves that the design was not simply forgotten.

To prove that the fifth painting exists, here it is:

The fact that Eaves had created a fifth painting shows that they weren't necessarily limiting themselves to the four that we see. But it seems that when it came time to hang them in the Ready Room set, they chose that particular wall, which only fits four of the drawings. Accordingly, the CV-6 drawing was set aside and there would have been no need to make an XCV 330 drawing.

In choosing four, they seemed to go for diversity over continuity, as the article observes. Even if wall-space considerations weren't the deciding factor, the choices are well-balanced with two sea vessels and two space vessels.

Answer 2

Technically, the second picture is NOT the same ship. Archer's screenshot shows the post-WWII nuclear powered aircraft carrier USS Enterprise CVN-65, whereas the second screenshot shows the famous WWII aircraft carrier hull number CV-6 as noted earlier.