Just about everyone turns a square edge on the inside of their first bowl. The funny thing is that is much harder than turning a slope from lip to base. That looks like a great start, and you are well on your way.
If you want a suggestions, please continue to read. If not stop here.
A little more time sanding will make a world of difference in the final outcome of your bowls. You do not need to go to the micromesh level that you do with pens, but making sure you sand out all your cut lines is important. If you have a round nose scraper, look up shear scraping the inside of a bowl It will decrease your sanding time.
The final suggestion is to sharpen your tools often. That will also decrease your sanding time.
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