The main image, which takes up the majority of the page, is of an artist's palette.
These aspects are of more interest to buyers.
It seems that in sentence two, we can remove the preposition 'of' by turning interest into a gerund.
These aspects are more interesting to buyers. Without the gerund, the sentence sounds awkward and is incorrect.
These aspects are more interest to buyers.
In sentence one, it seems that even without the preposition 'of', and something to replace it with, the sentence seems makes sense and is not awkward.
The main image, which takes takes up the majority of the page, is an artist's palette.
Why does sentence one sound fine without the preposition (is it grammatically correct?), while sentence two doesn't really work without the preposition and gerund replacement?