Freed up from work, so came back to take a swing at the examples to show a few examples of how I might approach these types of poses as an example for how to utilize the line of motion
The male pose is a little tricky, because a front-facing reclined seated pose like that is, by nature, a little limited with how much you can adjust the line of action a well as vary the angling of the body with out changing the pose up significantly. In some cases, rotating the camera like I did for the upper sketch might work. You can then use the line to figure out the character's posture and use that to influence the pose. In this case I drew him slouching a bit lol. Forgive the awkward foreshortening of the arm coming towards the viewer
The one below is the same pose, but from the front like the original drawing. I don't know that it's much different from yours, fundamentally, other than the character is leaning back further which promotes some additional foreshortening of the body (that's what the arrows were kinda conveying, I guess lol)
I found it a little easier to play around with the female pose in this case because I find it easier to breath life into my poses when they're not straight-on angles
Bottom left is most similar to the original drawing. I think when sitting like that it's a little more natural looking to lean back a bit rather than forward (unless you're reaching for your toes, maybe?)
Top right was a variation and more from a front-on side view.
Bottom right with the crossed legs is my attempt at a leaning forward seated pose. With that one the red line of action is still mostly vertical, so they don't always have to be crazy, but sometimes just working out creative ways to implement the limbs (arms/legs) can help spruce up an otherwise not super exciting pose