@ArtofAleksey Okay, the boat is very cool and I like the design itself. As for the execution, I think one thing that would benefit your drawing is to use major forms to define the bounds of your object before you start drawing, specifically cubes. If you can think of everything as a cube first and lay it down as such in a very light initial sketch, it will be much easier to then “fill” those cubes with the shapes you want. You’ll get a more accurate perspective.
The view of the boat is pretty wide-angle, yet the fronts of the hulls seem to have the same shape. The hull on the left should be more foreshortened since it is closer to our eyeline. Also, the rope shouldn’t be changing in size so significantly. The distance from hull to rigging doesn’t feel great enough to warrant such a shift in size.
Lastly, the line weights are kinda all over the place. I suggest trying to use heavier lines to define the major forms (hulls, cabin, stairs) first. As it is the sail itself is getting a lot of weight and attention, but the sail should feel relatively light and breezy compared to the big, heavy, rigid shapes of the boat itself.
I like the cabin a lot and you nailed those side windows.