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Each of those double stops requires a shift to get to the next one, unless you want to stretch the last two notes, which I guess is possible, but would take an uncharacteristically long time to practice, since it spans a seventh with other notes in the middle. 16th notes under beat 80 isn't slow, you know. Mmm... kind of, but generally no. Double stops involving at least one open string adjacent to the string that a fingered note is being played will generally be okay (at moderate tempo). If they're in succession, perhaps keep them on the same two strings and the same position... Repeated double stops in the same position are also typically okay because you can settle there before moving to the next position. Slow thirds are fine, but not too many of them; same with sixths. Fourths can be more awkward. Honestly, it's very case by case and there's too many possible scenarios to list them all. Learn by doing is probably better than anything I just wrote up above.

The double stops in here, friend... daunting, especially in rapid succession like that. @fishyfry the piece sounds pretty okay with a martelé or detached stroke. I tried it. I believe the composer thought so too. The final measure is quite strange for the reasons fishfry pointed out. It also really stops the flow of the piece right at the end, which isn't particularly enjoyable. It's pretty good, I just think it by itself functions more like a bagatelle where development is scarce, which has its ups and downs...

This is very nice I think. I agree that it is coherent and and flows as well as any work you've done before. Regarding the bowing: Do you intend for the violin to play the majority of the piece detached? If so, that's fine, but I imagine the music being smoother, with most of the notes slurred. If that is your intention, I think it would be extremely helpful to mark where you would want the slurs to be. Also, a few questions regarding the final measure: Is it normal to have an accented note in the middle of a slur like that? Seems a little awkward to me. Might the violinist have a difficult time with slurred double stops in quick succession? What is the fermata there meaning exactly? If it is to elongate the final note, why not use the empty bar space in front of it to make that a little clearer.