Welcome to the forum Bob.
For a first, you're doing well - and Colin, above, has made some very helpful comments.
I like the feeling of a sunny but cool day. I like the way you've handled a crowded scene.
Some tips that might help -
You seem to be using the paint pretty thickly but a bit dry - add a little water to make it flow better - be patient, it often needs more than one coat with acrylics to get a solid colour!
Try to avoid using black - it's usually deadening to colour - make your black by using mixes from your palette - that way you'll get a richness to the colour.
Remember shadows are transparent and you can see forms in them - not just silhouetted against them.
We run a monthly challenge called Different Strokes - near the top of the forum - often makes us think differently and it's fun! Do take a look and it would be nice to have you join us.