I don't have my comic yet, but I study as much as I can about how to make a good one, so hopefully my opinion will be a valid one.
The art isn't bad, though I would suggest structuring your characters, with special attention on the chest, shoulders, and how the neck connects the head. And watch out for mistakes, such as the guy in the red shirt - one of his arms is missing, and his other hand does nothing in the whole strip. If you never show it typing, it looks like it is just floating above the keyboard. He doesn't hold the mouse as he uses the computer (an odd mouse, if I may add, as it is modern with being wireless meanwhile the monitor looks very old, especially because it looks yellowed from age)
Also, I really don't like the copypasted panels and the stiff expressions. But the most important thing would be not to copypaste, that's very boring and shows the reader you didn't spend much time on it. I'd also suggest moving around with the camera a little. I would zoom on the second panel a little to show the facial expressions better (which they should have changed at least a bit) . I'd make the speech bubbles bigger a bit so the text has some space from the borderline, making the bubbles look cleaner. I'd also give the bubbles a black outline, making them distinct from the light gray wall.
Another thing: The sound effect on the bottom of the last panel isn't noticable (I only found it after the third read as I was looking through carefully for mistakes) and does not fit in the timeline of the events. As you read the panel, it goes
1 speech -> 2 error message -> 3 fizzle, instead of
1 speech -> 2 the computer fizzling -> 3 then showing the error message, as in real life. I don't know if you meant it this way.
I hope I was helpful.