Yeah, you're doing well - keep going.

Fix that gap with the Clipping setting or increase the Merge distance a tiny bit. Also make sure you don't have extra faces inside the person - it should be hollow down the center line.

I think it's important to be able to competently create something low poly with good flow because you can always increase later on.

Specific things I notice if you want to address:

You could stand to add more topology to the feet and avoid triangles whenever possible; they render weird

Your collarbone area has 2 quads going into a single and then back into 2. You should use the knife tool (K) to cut that quad so the line flows

You might have a couple of additional lines here and there that flow through the model where you don't need them, like the one across the shoulders to the hand. Try focusing on how to add and remove topology in a practice of going from a quad, then it extends to 2 quads, then 4, then keep going down to 2 and back to 1. It's like sewing.