Here's a short video on values.
I wasn't quite sure what you meant about wanting to learn more about blending techniques, but I thought you might mean that you are having problems moving from light areas to shadows, and if that's the case that video might help. But if you mean seamless blending, there are so many ways to paint. I don't know what your goals are or what other artists you admire, but I really like the graphic quality of your work, which comes in part from not blending a lot. Some art teachers do teach how to seamlessly blend, but others teach something called the tile method, where you block in some big simple light and dark shapes, then gradually refine them with distinct unblended brushstrokes of paint. I think this might work very well with acrylics since they dry so quickly. I have an acquaintance, Hollis Dunlap, who paints this way. He lives a couple of blocks from me so I've gotten to know his work. Here's one of his paintings on Instragram where you can see his technique if you zoom in:
https://www.instagram.com/p/CADYMHeH23D/
(He's insanely good.)