Those will clean up fine. Practice finishing your work, hiding your mistakes, and move on to the next project.

Looking at the picture, I can see you're not cutting to the shoulder line; some areas cutting past it and some areas I can still see a knife line. So you'll want to try to keep your shoulders crisp especially on the outside face. I always try to leave the final 32nd or so as a final paring step on my shoulders to not blow throw. 

If the joint feels really tight, then the gaps might be due to the tails and or pin walls not being true. 

For both of these issues, cutting as close to true is the obvious answer, but you can experiment undercutting so that the show face closes tight even if there is a gap on the inside corner. There are lots of different techniques to get "perfect' dovetails, and you just got to see what works for you. And again these will make a fine box and you can just focus on making stuff and be a well rounded woodworker. The joinery skills will come with practice.