Not liking your art is a natural part of being an aspiring artist. It's a feeling that will never go away completely. It's not the sketches themselves that matter, it's the fact that you're putting effort in the practice yourself. What really matters is that as you continue to put in your practice, you'll start to notice little things to focus on, similarities between poses, little things that you'll get just a little bit better at. When you put in a longer, more serious piece out later, you'll notice definitive improvements over your last serious attempt and you'll suddenly become proud of all your effort. But above all, everything you create is unique, nobody will ever create something exactly like yours. There are artists who make money off their flawed work, and artists as a profession who hate their work.
tl;dr you're not going to suddenly love every piece of art you make, but rather the practice you do will give you satisfaction every so often.
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