I started with an objective...

...and I end up doing something I don't really don't know.
If any of you can analyse it and give me some feedback, I'd appreciate.

Thank you

10ths at the end not 6ths. 
m. 7's linear escape tone sounds a little awkward.
mm. 11-12's transfer of the F from bass to soprano is... technically fine, but sounds a little weird.

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10ths at the end not 6ths. 

My mistake. Thanks for point that out.

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m. 7's linear escape tone sounds a little awkward.

Not familiar with the term escape tone but I think you're talking about the F in the upper voice. Am I right?

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mm. 11-12's transfer of the F from bass to soprano is... technically fine, but sounds a little weird.

Well, I had the fixed melody. I could use another note in the bass, an A for ex (a 6th, for A to F, but them I would have a large leap.

I could also think about creating a 5th that that would result in a tritone (B to F). This one seemed the best choice on the moment.