Overall, this is a cute and original idea, and the lines seem nice and neat. I like that you tried a bit of perspective in this to expand your horizons in art. I do feel that it needs some color, though, and a little TLC in the shading department.
Cute and original idea, I like it! Tentacool hat is pretty neat, I'd get one. That is, if it didn't sting. I love that you tried out a little perspective here, though it does need some work. The human below Tenta doesn't quite have the same angle and depth to him that the Pokemon does, and therefore looks mismatched and a bit awkward. Try fixing this next time, and perhaps look up a tutorial on perspective online. If you like, you can PM me and I'll help you!
There really is no color or shading to speak of, here, and that's a shame. This piece could benefit greatly from at least a bit of shading. That would help your perspective illusion, and give Tenta some needed texture and lighting. Color, as well, would have been very nice to see here, be it with pencils or digitally. Color instantly makes your drawing more interesting and gives it that little 'oomph' that wows people. Perhaps next time you could spent a little time coloring your piece and showcasing a more polished image.
Yep! It all looks good; nothing to complain about here.
1. Color your work! It does a world of good for your art.
2. Add shading! This adds depth and will help you immensely with your depth and perspective.
3. A background would be nice, even a simple one. This adds more interest to the drawing, and adds points for effort!
4. Study up on perspective a little and try to keep the angle consistent throughout the whole image.
Though this is a cute, enjoyable piece, I give this a 25/40. It's enough to pass for an Easiest-level Pokemon, but not for a Simple. Fix up your art with the tips I gave you and come back, and we can re-curate it to try again! For now, though, Tentacool is not caught.