Am I a good candidate for sliding genioplasty? Want to add some vertical length to my face and bring my chin forward (Photo)

Your wishes and illustration are feasible and realistic, you seek and indeed would benefit from a two dimensional augmentation genioplasty with bone supply, so that your chin increases anteriorly and also vertically; eventually and if indicated and you wished so (very commonly done in males) we could also add a bit of horizontal widening.
I strongly advise you against fillers (very dangerous), chin implants (your goals unfeasible with them and associated with a large list of major complications and undesireable effects) or simple sliding genioplasties (a conceptual error: a sliding genioplasty IS NOT indicated for microgenia or small chins but for weak receded chins in which ONLY projection is sought; you are a case for chin augmentation, a sliding genioplasty is safe, beneficial and simple technically but not for you).
Very few surgeons do have experience in multidimensional genioplasties to either augment or decrease the chin area in one, two or more spacial axis; the case of males seeking multidimensional chin augmentation is pretty common in my office, and the amount of increase is virtually unlimited; the bone supply grafted is normally harvested from the elbow or alteranively, should the case require a lot of bone or the elbow be too slim, from the iliac bone (hip). The procedure is done inside the mouth without visible external facial scars, and evidently requires a very very meticulous preop plannin on cephalometric Xrays and thorough discussion and illustrations with the patient in the office. It is a safe procedure, taking (for augmentations) 3-4 hours depending the complexity and the final assembly, requires great experience, fine skills, mental ability to model 3D, training and a great does of creativity. I am doing such genioplasties many decades ago with great satisfaction in my patients.
If you wish better grounded opinion well lit, focused and standard images have to be assessed: frontal, both lateral and both oblique views.
Feel free to request any additional information from me.

yes. your chin profile/projection and contour can be improved with a sliding genioplasty. The actual jawline can also be addressed since the mid body of the lower jaw is a critical area to address when you do a chin procedure and it is a focus to ensure a smooth continuous line contour. Talk to the surgeon about these specifics