Wow... these sketches are great! I believe I see a couple of geese there, there wing positions are wonderful. You have really progressed with your drawings friend. Graphite pencils are wonderful to draw with for sure. If you keep drawing with pencils ( and I think you should because your doing very well with it.) Anyways you might want to consider buying a kneaded eraser, you will not ruin your paper by erasing, and you can lift away pencil to create hi lights. And if you get even further into it, you might also consider investing in a professional pencil set with a smudging pen for shading. Keep up the great work, it’s fun to watch you grow❣️