I downloaded and looked at your images. They are not bad and very complex. However, they could use some "tweaking", especially the first one. There are a lot of confetti stitches and the colors don't go smoothly to match the overall designs. For example, there are too many colors for each of the straight lines as well as the curves. The computer sees the colors differently and you often have to reduce the number of colors originally chosen and change colors to make the lines LOOK better after the initial conversion. That is "tweaking".
It can be very time consuming. I once took hours on what was a simple cartoon design because of that issue -- simple black lines weren't "simple" on initial input. There were a lot of shades of gray and confetti stitches includes.
I once did a design that was black and white and ended up with some yellow in shaded areas because there weren't enough shades of gray available. That is the issue.
I think with a bit more work, your "not bad" designs can be absolutely stunning -- especially that mandala one at the start. I love those kinds of designs.