Your perler bead Pokemon are FANTASTIC! I really like how you represent each one really as it appears in the game, more pixelated. The shadows on this Ekans are just a little off - I'm not sure if there is direct light shining on him, because some parts of him seem a little lighter, but I'm also unsure if he is bending his tail because of his large stripe of purple. They look a little unnatural - I'm sure more reference pictures could help with that. I really like his pose being a little different than just curled up as usual too. Overall, fantastic work on this piece!
I like it! As I've already said in the last critique I've done, this technique requires a lot of patience and precision. I've just noticed you've missed a shadow, it was on the tail, behind Ekans' neck. But it isn't so important, afterall! It is a great work, so nevermind :3 Ekans has got a lot of colours and this thing makes the Pokémon difficult to be reproduced. Your work is really creative especially for the choice of the colours used for the shadows and the lights, which don't clash with the rest of the colours. Congrats and keep it up! :3