Severe cellulite on biceps. What would be the BEST procedure? (photos)

Unfortunately, there are limitations to what can be improved.

Arms will likely require a combination of further liposuction and/or fat transfer for unevenness, with skin excision.

You are correct, the cellulite cannot be completely removed. Hopefully, contour and smoothness can be improved.

An exam and consultation with your/a plastic surgeon is recommended to further discuss your options and expectations.

I would first use Morpheus micro-needling and Renuvion to tighten the skin as much as possible, then later do very careful fat transfers to fill in the dips.

Thank you for your question on your biceps cellulite post-liposuction. In essence:
Your arm cellulite appears to be a result of scarring from liposuction. This can cause dimpling similar to natural cellulite. To address this, a brachioplasty (arm lift) is recommended:
Procedure: It eliminates excess skin and fat from the upper arm. An incision is made from the armpit to the elbow, removing excess skin.
Duration: 3 to 4 hours under general anesthesia.
Recovery: Return to desk jobs in 2 weeks. For more physical roles, 3 to 4 weeks.
This procedure should improve the appearance of your arms. Best wishes!