I wouldn't be worried about it exactly, and it's worth being aware that it's pretty normal to put more detail and polish into the drawing of the face than the rest of a character (because the face is where the reader will look the most) but perhaps particularly on that first page the difference in detail level between the face and body is a bit jarring.
That said, as everyone else has said, this is a short comic. Your aim is to learn here, and this is a great opportunity for that, so rather than stressing over it, just focus on getting the thing done and then you can write down all the stuff you learned and ask for advice on how you could make it better.
But for advice going forwards, the main thing I'm noticing here is that it looks like the faces are drawn very tightly, with a lot of care and really controlled lines, while the bodies look rushed and with the floppy, deflated quality of letting the line smoothing do its own bidding. As this is a learning comic, that's a habit I recommend not getting into. Even if the style is simple, or especially when the style is simple, try to make each line do something purposeful like defining tension or relaxation.
There's an excellent book that would really help you at this stage in your development called "Drawn to Life" by Walt Stanchfield. Its a collection of lecture notes a legendary Disney animator used to train the team of newbie animators who would work on The Little Mermaid, Aladdin etc. I think you'd really get a lot out of it if you can buy a copy or get one from your local library.
As another potentially useful resource (not a plug! No obligation to subscribe or anything, this is just to give you something to compare to) you're welcome to have a look at my comic:
We have styles that aren't a million miles apart and I think some similar influences. I don't generally do incredible levels of detail, and you can see, my faces are less detailed than yours, but the bodies are a bit more detailed. It might help to use it as a measuring stick for what's a reasonable balance, especially looking at how I often only even draw backgrounds in panels once or twice on an average page.
Keep it up! Your comic is coming along great, so at least see it through to the finish and collect all that sweet comics experience to apply to future projects!