That is an incredible idea. I need to start doing this with all of my stuff.

Write the date on them and keep them in your shop. You'll look back in years and be amazed at how far you've come!

You used nice wood on your first dovetails? Nice!

Agreed most of the gaps look like they are one saw kerf on the wrong side of the line. 

It is a really nice thing about handsaws; draw a line, cut on the line, no fussing with jigs, or trying to align things. If you can draw or transfer the line you can cut it.

Thanks for the advice. I've still gotta do it  6 more times and definately gonna go slower. My angle cutting on the zebra boards I was proud withwhich I did second. I knew there were some issues with the walnut ones but am just planning on hiding the mistakes here with woodglue and sawdust.

The problem of not staying on the right side of the layout lines. Honestly, I think it would be better to practice on the configuration that the dovetails are going to be used (90 degree angles). 
It's really all about being able to cut and chisel accurately to a scribe line. All woodworking involves doing operations accurately, be it table saw, router, or hand tools. The more accurate you are, the better the finished product.
Learn how to "sneak up on" the layout lines.

I think his aim was to learn to cut dovetails.

Those are close enough that you can cut slivers to wedge in when you glue and rub the darker color sawdust in there with the glue and you may be surprised how close you are.

I'm still planning on using it for the dice tray I'm making. The dovetails in this scenario are just decorative and the zebra ones are going to be an inlay so iv gotta do it all again. Gonna go slower with more precision and less beers.

Far better than the ones I cut with my CNC.

Plane down the edges of both boards and they’ll be almost perfect!

Those look really, but dovetails are generally for 90degree joints

First hand cut dovetails. Overly ambitious is my downfall.