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Since your novel is already practically finished, you can ask your beta readers if no character descriptions works. Ultimately, that's the only way you can really know if something works or not. A...
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#3: Attribution notice added
Source: https://writers.stackexchange.com/a/45749 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#2: Initial revision
Since your novel is already practically finished, you can ask your beta readers if no character descriptions works. Ultimately, that's the only way you can really know if something works or not. As others have pointed out, having no physical description of your characters can theoretically work. As an example, I have very little recollection of what the men in Hemingway's _The Sun Also Rises_ look like (other than Pedro Romero). Maybe Hemingway described them, but if so, it didn't leave much of a mark on me. Or, another example: it is not until midway through Ursula Le Guin's _The Left Hand of Darkness_ that we get a hint of the MC's skin colour, and I don't recall a mention of any of his other physical features. It could be, however, that for some reason or another, it doesn't work in your story. It could be that for whatever reason your readers would feel they need a description. Or maybe it does work, and you're worrying without need. Let your beta readers tell you.