Workout routine for the summer

Hi everyone I'm 17 and weigh 63 kg (lost 7 in three months). I'd like to go back to my old healthy weight of 50 kg. My workout routine consists of:

-30 mins high intensity Elliptical (30 mins high intensity stationary bike on alternate days)
-4x12 Seated leg press
-4x12 Shoulder press

Summer's coming in about in 3 months, and since I'm in the progress of losing weight, I might as well aim to have a decent looking body for the season! My diet's been sorted out. Question is:

Is there any improvement I could make on my workout routine to lose weight and tone up for the summer?

I'm still a bit clueless on which kinds of workout I should do to get to my goal. I'd love to hear from you guys on what you reckon/suggest I should do Thank you so much everyone!