My vegetable garden woes

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I wanted to share some pictures of my garden and ask for advice! I have a lot of time to devote to this but am new to gardening. Any help and comments from gardenlady and any others who know about plants would be greatly appreciated.

I started this vegetable garden in early April with a combination of the native (clay) soil, 50 or so 40b bags of topsoil, organic compost with cow manure, and unpasteurized dry horse manure. It contains a lot of cool weather vegetables (lettuce, cabbage, brussels sprouts, turnips, radishes, kale, collards) and a few other things, and herbs around the edges. Here are some early pictures. (The one in the top left corner is obviously the earliest, from right after I finished digging. I just found it and added it to this post while adjusting my pictures.)

It's been a few weeks since then and parts of the garden have really filled out, but some parts haven't. For instance, the little black trellises had peas planted under them, and the instructions on the pea packet said they would absolutely love being planted when it was still chilly, but they never sprouted. :( I planted red and white swiss chard and the red is now thriving, but nothing happened with the white. Everything else seems to be growing, including some tomatoes and peppers I started indoors and added later.

Question: I am just wondering why some veggies didn't sprout. Is it possibly the soil composition? Or should I just not worry about it and resow them?

Thanks and I hope you enjoy the pictures!