This is actually drawn really well.
I like original drawings more than tutorial-based ones. It originality. That doesn't mean it's not good though.
I like how you did the background. It's happy and colourful, but doesn't attract the attraction that would normally go to the Pokémon.
I'll just say something about each of the Pokémon. Know that I think each of the Pokémon is drawn good, there's no ugly one. All mistakes are details. And sorry if I spelt a name wrong.
I really like how you drew Pidgeotto. His posture is good, and his/her claws look really great. I don't know many people who can draw him/her this way. The wings look different from the Pidgeotto's in the series though. The feathers are a bit more square, and the lines separating the feathers should be a bit longer. This doesn't ruin him or anything, just a detail.
Nidoqueen is drawn good too, but with more mistakes than the rest of the Pokémon. That´s probably because she is the hardest pokemon to draw, with all her scales.
Nidoqueen´s mouth is a bit odd. The black in the middle is too square, you should make the gap a bit larger. Second, her ear shouldn´t be the same colour as her belly, but brown. Another colouring mistake is that her right boob should be yellow. Lastly, the length of some of her body parts seem too small. Her head shouldn´t be as large as her body. I understand that it would seem odd if one pokemon was half of the painting. So maybe you could put her on the far background, so you can draw her realistically large?
Pikachu is drawn nicely. Although his hands should have fingers, and his head shouId be connected to his body more, I forgive you because you drew the cheesy smile so nice. His small eyes are just too cute. And that while Pikachu is one of my least favorite Pokémon.
Ivysaur is drawn almost perfectly as well. The only thing I can find with him is that the dots on his body should be green/blueish and not red.
For haunter the only thing I would've liked differently is a bit more variationg in colour. Now almost his entire body is the same colour. But his shape is perfect, and his mouth is amazing.
Paras seems a bit sad, but ah well, he's probably always like that. I actually like that. (Not that he's sad, but how you drew him). The only mistake I see with him is that his back legs are a bit too big. But the rest is drawn well. Especially the mushrooms.
These are the "mistakes" I can see in your drawing. Though there are some mistakes, your cousin can certainly be happy if he gets this drawing. It's happy, colourful, and your best drawing yet.
A very happy birthday to your cousin.
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