This personally reminds me of the scene the Shrek (first one!) where Fiona goes off into the woods to get breakfast, meets a bird, and explodes that same bird. Then takes the eggs of that bird and makes delicious eggs for breakfast!
The best advice I can give is just to practice, practice, practice. Even me, each drawing builds up on the last one. It's all practice and remember that it's supposed to be fun, so don't get overwhelmed if things don't turn out perfect. Just take a breather and come back to it. I hope that helped unless there is a specific question you have, like, how do I draw hands or foreshorten an arm?
WEEEEEEEEEEEEEEEEEEEEEEEEEEE !! That's really the kind of sweet and lovely art that I absolutely love ! Sure, I'm kinda biased I guess because Spring is my favorite season by far and Penny is awesomly lovely (and busty ) character So it makes like the perfect equation to my eyes ^^ If ever I can, I'm really gonna try to get a commission from you (if ever you still take some) 'cause Penny and Gigi in a spring theme pic' sounds just awesome after seeing this one ^^