OK I know this thread is old, but what I see here is a problem most new sketchers have, but is rarely pointed out to them.
They have understood the theory of vanishing points, but move them too close - naturally to fit on paper. What happens is that perspective is technically correct, but it’s really forced and is not how humans see things! So here’s a rule of thumb:
The angle where the perspective lines meet should not be less than 90 degrees! Where it is AT LEAST 90 degrees should be the BOTTOM of your object.
