I think you could improve your bookstore sprites by toning down the bright colors of the books. You chose a soothing, duller blue palette that works well for the floor and the storefront, so desaturating the books a bit will help them match better. Also, I just noticed one of your books is empty (middle furthest-right shelf). I think the color variation in the carpet and dirt is a nice touch, you should try doing that with the grass as well (or maybe add flowers, rocks, etc.) As for your walking sprites, you should try making a gif so we can see it in action! Judging from the stills, I think you're heading in the right direction. The arms look really thin when your character moves them away from their body--you might want to try making them 1px thicker, or bending them so it looks a bit more natural. In the GTA video, the arms have a 1px outline, so they don't seem as thin. Also, I wonder if adding a crease where the leg bends in your back walking sprites might make things more interesting than just shortening the leg. Hope this helps!
Also I just wanted to say, congrats on taking the first step and putting your work out there!
You've picked some good references and it's a great idea to start with something simple to get the hang of making sprite art and animating. Good luck with your project!
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