Cover wise, what are you thinking of? Pic or CGI image? Def more flexibility with CGI (or any type of "drawn" image) but some would say that a pic would appear more organic... But hunting for a pic (esp one that the photographer released copyrights to) might get pricey for the "perfect" shot...
Anyhow... Only mid-way thru the first book, so I don't have a feel of the proverbial "narrative arc" but if I were the author, here's what I would talk to my graphic artist...
Where is the story going? What speaks to you most about the characters?
Since I'm only on Ch 9, I'll "step" into your shoes for a min... At this point, Sam's all about landing the triple jumps... He's also teaching Amber a few spins is it... Camel? Don't remember to be honest... Sorry...
Cover wise, you could emphasize the theme by having him "land" the triple... Tie-in would be "landing" the jock? Does he land the jock?
(Don't answer... no spoilers... )
The spins can also be used for the cover... Easier to think of imagery here... If it's the camel that he's teaching Amber, I'd go for a pose that isn't in the "apex(?)" of the spin... Though a perfect T is the ideal, graphically speaking, I like a little asymetry in sports poses... So maybe when the extended leg is only 30 or 45 degrees? Yeah, I have a pointe fetish... Thematically, what good piece of lit is there where we're given a story of "perfection" right? So having a 30 degree pointe would convey "work in progress" as opposed to "landing" the jump...
I mean, I'm gay and all... And visually oriented... But if this were "breeder romance" I would have Amber portrayed doing a layback spin with the back leg extended in a 45 deg pointe... But that's just for visual and not thematic...
Hey... You asked for cover ideas, right? ;-)
Just wanting to "give back" for a cool story...