Seems to work.

Luminous

Sankoku's approach seems reasonable:
1. つぶつぶ｟名｠
多くのつぶ（の一つ一つ）。
2. つぶつぶ｟副・自サ｠
多くのつぶの形が感じられるようす。
「泡(あわ)は━流れました・━（と）した食感」

See also GendaiRK:
1.〘副〙〈－する〉粒立つさま。ぶつぶつ。「つぶつぶと泡が立つ」「つぶつぶした餡(あん)」
2. 粒状のもの。ぶつぶつ。「顔につぶつぶができる」

Iwakoku: 〘名ナノ・副［と］・ス自〙


Google N-gram Corpus Counts
╭─ーーーーー─┬─────────┬───────╮
│ つぶつぶ　 │ 285.613 │ 89.7% │
│ つぶつぶの │  22.307 │  7.0% │
│ つぶつぶし │   5.258 │  1.7% │
│ つぶつぶと │   4.223 │  1.3% │
│ つぶつぶな │   1.158 │  0.4% │
╰─ーーーーー─┴─────────┴───────╯

I don't think having it as one sense works. It can refer to physical grains or lumps, and to the sensation.
In the BCCWJ, result POSs are also separate, as 名詞-普通名詞-一般 or as 副詞.

There are also multiple archaic senses which I chose not to include here. Because I would either add all of them (6) or none.

Maybe like this?

@@ -19 +18,0 @@
-<pos>&adj-no;</pos>
@@ -23 +22,17 @@
-<gloss>bumpiness</gloss>
+<gloss>drops</gloss>
+<gloss>beads</gloss>
+<gloss>pulp</gloss>
+</sense>
+<sense>
+<pos>&adj-no;</pos>
+<pos>&adv;</pos>
+<pos>&adv-to;</pos>
+<pos>&vs;</pos>
+<pos>&vi;</pos>
+<misc>&uk;</misc>
+<gloss>grainy</gloss>
+<gloss>bumpy</gloss>
+<gloss>coarse</gloss>
+<gloss>bubbly</gloss>
+<gloss>foamy</gloss>
+<gloss>lumpy</gloss>

I think it's one sense.

@@ -13,6 +13,4 @@
-<sense>
-<pos>&n;</pos>
-<misc>&uk;</misc>
-<gloss>grains</gloss>
-<gloss>lumps</gloss>
-</sense>
+<r_ele>
+<reb>ツブツブ</reb>
+<re_nokanji/>
+</r_ele>
@@ -23,2 +21,2 @@
-<gloss>granulated</gloss>
-<gloss>lumpy</gloss>
+<gloss>grains</gloss>
+<gloss>lumps</gloss>

つぶつぶ	285613	68.4%
ツブツブ	64492	15.4%
粒々	67639	16.2%

adding uk

@@ -14,0 +15 @@
+<misc>&uk;</misc>
@@ -20,0 +22 @@
+<misc>&uk;</misc>