Your work - your time - your price
But, you need to be aware that if you’re going to charge prices like this:
For reference, if I were to price the examples in my original post, I would set the price for the first one at about 110 EUR (118 USD), the second one 140 EUR (150 USD), and the third 60 EUR (65 USD).
people on forums may be not be your target and the art must be exceptionally good to consider the range you proposed. Now when probably 90% of community is struggling with money, adding to that the amount of authors (upcoming or not) that are looking for free art/covers or cheaper prices - if you want to charge someone 100$+ it’ll be very hard for you to find clients.
What I can suggest is lowering your price list, maybe include it in your post after you alter it, and work on an additional examples that are not “edits” like you mentioned in your response to @/maandy to show your skillset. That way people will also know what they’re paying for, and your style per-se.